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  Anyone here running 2 1/2 " exhaust on a 65 - 68??

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Author Topic:   Anyone here running 2 1/2 " exhaust on a 65 - 68??
bgseib
Journeyman

Posts: 90
From: Tyler, TX, USA
Registered: Dec 2001

posted 10-23-2002 09:35 AM     Click Here to See the Profile for bgseib   Click Here to Email bgseib     Edit/Delete Message   Reply w/Quote
I am about to get my exhaust replaced, and I just don't feel right running 3" from the headers tapered down to 2 1/2 to the mufflers, then at the end of the mufflers he said it would be to hard to run 2 1/2 around the axle, so he wants to run 2 1/4 from the mufflers back...
This just seems like it would create a blockage at the muffler exit...
Does anyone here run 2 1/2 all the way?? Is it really to hard to bend that pipe around the axle???

Thanks,
Brian

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johnmustang
Gearhead

Posts: 2364
From: Vancouver Island , British Columbia , Canada
Registered: Nov 2001

posted 10-23-2002 09:45 AM     Click Here to See the Profile for johnmustang   Click Here to Email johnmustang     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by bgseib:
I am about to get my exhaust replaced, and I just don't feel right running 3" from the headers tapered down to 2 1/2 to the mufflers, then at the end of the mufflers he said it would be to hard to run 2 1/2 around the axle, so he wants to run 2 1/4 from the mufflers back...
This just seems like it would create a blockage at the muffler exit...
Does anyone here run 2 1/2 all the way?? Is it really to hard to bend that pipe around the axle???

Thanks,
Brian


I have 2 1/2" all the way from front to back , on my 65 fastback 289. It is a custom job and mandrel bent. no problem getting it up and over the rear axle. Does not seem to be any blockage at all , works and sounds great for a street car. I hope you are not going with flowmasters

JOHN

------------------
65 2+2 FASTBACK
68 COUPE (SOLD)
87 TAURUS WAGON
98 F150 XLT TRITON V8 4.6, 4 WHEEL DRIVE
Member:Vancouver Island Mustang Association
M&M #1710
MyPhotoPage
MY TRUCK

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68DARKHORSE
Gearhead

Posts: 116
From:
Registered: Aug 2002

posted 10-23-2002 09:51 AM     Click Here to See the Profile for 68DARKHORSE   Click Here to Email 68DARKHORSE     Edit/Delete Message   Reply w/Quote
Get the Flowmaster mandrel bent 2 1/2" pipes(they can be purchased without mufflers) and Dynomax Super Turbos.

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bgseib
Journeyman

Posts: 90
From: Tyler, TX, USA
Registered: Dec 2001

posted 10-23-2002 10:13 AM     Click Here to See the Profile for bgseib   Click Here to Email bgseib     Edit/Delete Message   Reply w/Quote
Well, actually I am going with the flowmasters... I just really like the way they sound... Why do you dislike them so much? Is it the sound, or price, or what?? Just curious... I did not think the 2 1/2 would be that big of a deal either, but the guy seems like he is real worried about it.... I don't know why...

Brian

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n2oMike
Gearhead

Posts: 1050
From: Spencer, WV
Registered: Jan 2001

posted 10-23-2002 10:15 AM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
Yea, just call Summit and ask for a pair of Flowmaster 2.5" mandrel bent tailpipes for a 66 mustang. They only cost $99/pair, and are the best money you will spend on your exhaust system.

When you take them to the muffler shop, the technician will think they are the coolest things he's ever seen.

Years ago, before these were being made, I had a 2.5" exhaust fabricated by a good local exhaust shop. We bent up FIVE different tailpipes before we got two that we were somewhat happy with. The guy didn't even charge me extra... He would have loved for me to show up with those mandrel bent Flowmasters!

As a side note...

There's not much muffler room under a 65-66 mustang. Do NOT use extra long mufflers. They just don't fit. The shorter they are, the more room you've got to make that first bend up and over the axle. Shorter is better. MUCH better.

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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mustangboy
Gearhead

Posts: 285
From: Ont, Canada
Registered: Mar 2002

posted 10-23-2002 10:20 AM     Click Here to See the Profile for mustangboy     Edit/Delete Message   Reply w/Quote
I run 2 1/2 from the headers to my mufflers(techflow afterburners)and then 2 1/4 tailpipes.This setup costs me about 2 tenths at the track,I use to have 2 1/4 all the way back and it would cost me 3 tenths.Also my tailpipes are not mandrel bent and they are squished pretty bad.I have to check into the flowmaster tailpipes but I've heard they're not available for GTs (exiting through the rear valence)so I'll have to see if there close enough to just modify at the tips to get them to fit.

------------------
1968 mustang j-code [email protected] 1963Falcon waiting for a rebirth.

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bgseib
Journeyman

Posts: 90
From: Tyler, TX, USA
Registered: Dec 2001

posted 10-23-2002 10:30 AM     Click Here to See the Profile for bgseib   Click Here to Email bgseib     Edit/Delete Message   Reply w/Quote
Does anyone know if the mandrell's from summit will exit out the valance (GT) or not?
And is mandrell really the only way to go with 2 1/2?
And are flowmaster 40's short mufflers or long?

Thanks,
Brian

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Tim65GT
Journeyman

Posts: 3
From: Lexington, KY, USA
Registered: Oct 2002

posted 10-23-2002 10:31 AM     Click Here to See the Profile for Tim65GT   Click Here to Email Tim65GT     Edit/Delete Message   Reply w/Quote
There goes John again - begging people not to use Flowmasters. I tell you, he really hates those things! Brian, I am going through the same thing right now. Can't decide what stuff to put in my exhaust system. I like the idea of the Flowmaster tailpipes, but I think I'm going with Dynomax Super Turbos. Still don't know for sure.

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rockafellz
Gearhead

Posts: 408
From: San Lorenzo, CA, USA
Registered: Aug 2001

posted 10-23-2002 10:37 AM     Click Here to See the Profile for rockafellz   Click Here to Email rockafellz     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by mustangboy:
I run 2 1/2 from the headers to my mufflers(techflow afterburners)and then 2 1/4 tailpipes.This setup costs me about 2 tenths at the track,I use to have 2 1/4 all the way back and it would cost me 3 tenths.Also my tailpipes are not mandrel bent and they are squished pretty bad.I have to check into the flowmaster tailpipes but I've heard they're not available for GTs (exiting through the rear valence)so I'll have to see if there close enough to just modify at the tips to get them to fit.


2 tenths huh? Pretty interesting. I guess when money permits, i'll have to get those flowmaster tailpipes.

Hey Brian,

I just got my new exhaust system installed and i've got 2.5" head pipes and 2.25" tailpipes like you mentioned. Not bad, but probably worth 2 tenths like mustangboy mentioned.

Erik

------------------
1966 Ford Mustang 2+2
Mine - Restomod in Progress

1966 Ford Mustang Coupe
Dad's - Original Unrestored

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ccode67
Gearhead

Posts: 1095
From: douglasville,ga,usa
Registered: Mar 2001

posted 10-23-2002 10:50 AM     Click Here to See the Profile for ccode67   Click Here to Email ccode67     Edit/Delete Message   Reply w/Quote
2.5 inch all the way out on my 67, it is tight over the axle especially with the rear sway bar, I wish I had bought the flowmaster tailpipes, they sure look cool.

I wanted 3 chamber Flowmasters but they were too long, went with 2 chamber 40 series, and yes it is too loud.

------------------
Stuart MCA #48902
M&M #1091
67 stang 5 speed, 351W,
Edelbrock Performer RPM package

Artificial Intelligence is no replacement for Natural Stupidity.

http://mustangsandmore.50megs.com/ccode67.html

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mustangboy
Gearhead

Posts: 285
From: Ont, Canada
Registered: Mar 2002

posted 10-23-2002 12:27 PM     Click Here to See the Profile for mustangboy     Edit/Delete Message   Reply w/Quote
To be fair I should mention that when I got the front pipes changed to 2 1/2 I also put on the new mufflers.I'm sure these were worth a few hp over the midas turbo mufflers that were on it with the 2 1/4.Can anyone tell me how the flowmaster tailpipes exit the car?Would it be hard to get them in the proper place for a 68 GT valence?

------------------
1968 mustang j-code [email protected] 1963Falcon waiting for a rebirth.

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indyphil
Gearhead

Posts: 160
From: Lafayette, IN, USA
Registered: Jul 2002

posted 10-23-2002 02:02 PM     Click Here to See the Profile for indyphil   Click Here to Email indyphil     Edit/Delete Message   Reply w/Quote
Just a quick note
I got a new exhaust fitted on the weekend.
2 and 1/4 inch all the way back. No headers yet. I was hearing about how 2-1/2 inch pipes will make more hp on a wild engine but might be bad for a stock engine (less low end torque and throttle response).

for a 289 2-1/4 inch is big enough for a stock engine that doesnt see much racing. depends what you want to do with the car.

My 2-1/4 seem to flow OK, make a nice noise (plain turbo mufflers) when compared to the crappy single exhaust I was using. Not too loud to annoy the neighboors but a nice throaty sound compared to stock

best part was, the whole job was free, from the headers back. The guy welding the hanger on the drivers side scorched the underside of the rear bench seat. The honest shop owner offered me new seats or the whole thing for free. Since you cant even see the tiny scorch mark when the seats are installed I took the free system!

------------------
'68 coupe 289 2V
CAT engine performance engineer

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68DARKHORSE
Gearhead

Posts: 116
From:
Registered: Aug 2002

posted 10-23-2002 02:12 PM     Click Here to See the Profile for 68DARKHORSE   Click Here to Email 68DARKHORSE     Edit/Delete Message   Reply w/Quote
Dynomax sounds and flows better than Flowmaster.

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n2oMike
Gearhead

Posts: 1050
From: Spencer, WV
Registered: Jan 2001

posted 10-23-2002 03:46 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by mustangboy:
I have to check into the flowmaster tailpipes but I've heard they're not available for GTs (exiting through the rear valence)so I'll have to see if there close enough to just modify at the tips to get them to fit.

They will need to be modified to exit the rear valance.

In addition... I have never had any experience with these, but MAC used to offer mandrel bent tailpipes for 65-66 mustangs @ $159... and they offered one part number for non-GT's and one for GT's (I'm assuming these would exit through the rear valalce)

They probably have a website...

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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69 Sportsroof
Gearhead

Posts: 359
From: Valley, Alabama, USA
Registered: Mar 2002

posted 10-23-2002 04:28 PM     Click Here to See the Profile for 69 Sportsroof   Click Here to Email 69 Sportsroof     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by 68DARKHORSE:
Dynomax sounds and flows better than Flowmaster.

This is true...

Plus, they have a $20 rebate going on now.

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bifs66
Gearhead

Posts: 102
From: Maryland
Registered: Apr 2000

posted 10-23-2002 07:54 PM     Click Here to See the Profile for bifs66   Click Here to Email bifs66     Edit/Delete Message   Reply w/Quote
I installed the whole Flowmaster "American Thunder" 2 1/2" exhaust system on the 66 Fastback (342" stroker, top loader). This was connected to Hooker "competition" long tube ceramic coated headers. IIRC, the headers were about $320 and the Flowmaster exhaust system was also about $320. A small connector pipe was required on each side to connect the header collector to the Flowmaster H-pipe. A local muffler shop bent these short pipes up for me for around $25. The tailpipes are made of stainless steel, and look exactly like the exhaust pipes on my 85 Mustang GT. They extend below the valence panel and are cut at an angle. I'm very satisfied with the result. Last weekend, the Fastback ran 13.2 @ 111 mph in complete street trim (regular radials, full exhaust, air cleaner in place , etc.)

------------------
Bernie Frank
66 Fastback restomod project
85 GT (preserved)
82 GT (original)

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bgseib
Journeyman

Posts: 90
From: Tyler, TX, USA
Registered: Dec 2001

posted 10-24-2002 11:04 AM     Click Here to See the Profile for bgseib   Click Here to Email bgseib     Edit/Delete Message   Reply w/Quote
Talked to the exhaust guy last night and he will do the 2 1/2 all the way out...
I am also going to have an H pipe put in.. Should look really cool, and sound great... I think I am going to stick with the flowmasters, just cause I know how they sound, and I have only heard one objection to them. And the ultra flows are bit more expensive than the flowmasters... I am open for suggestions if anyone likes any other types of mufflers and can tell me why they are worse or better...??

Thanks guys..

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n2oMike
Gearhead

Posts: 1050
From: Spencer, WV
Registered: Jan 2001

posted 10-24-2002 11:21 AM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
Be SURE to use the $99/pair Flowmaster tailpipes!

He will be able to crush bend a set of 2.5" tailpipes, but they will look like h*ll by the time he's done with them, and won't flow for sh*t.

It's good advice, and they're cheap. Been there, done that! They can be modified to exit the valance panel if needed. He can cut a section out or put a small bend or two in them to make them work. Don't use crush bent 2.5" tailpipes on a 65-66 mustang!

If you ignore my advice on the tailpipes, you'll wish you had listened.

Whichever way you go, short mufflers are mandatory.... especially if you are going to try and use crush bent pipe. You might look into 5.0 mustang specific mufflers. These are generally shorter than the 'universal' models.

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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mustangzrule
Journeyman

Posts: 85
From: Orion, MI
Registered: Sep 2002

posted 10-24-2002 11:39 AM     Click Here to See the Profile for mustangzrule   Click Here to Email mustangzrule     Edit/Delete Message   Reply w/Quote
I put Dynomax (Walker) mufflers on my 68 and they sound pretty nice and I have been told that they flow better than Flowmaster. They were cheaper too. How nice is that?

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68DARKHORSE
Gearhead

Posts: 116
From:
Registered: Aug 2002

posted 10-24-2002 12:34 PM     Click Here to See the Profile for 68DARKHORSE   Click Here to Email 68DARKHORSE     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by bgseib:
And the ultra flows are bit more expensive than the flowmasters...
Thanks guys..

40 series Flowmaster= $72.92
Dynomax Ultraflo= $59.95
Dynomax Super Turbo= $31.95

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bgseib
Journeyman

Posts: 90
From: Tyler, TX, USA
Registered: Dec 2001

posted 10-24-2002 02:16 PM     Click Here to See the Profile for bgseib   Click Here to Email bgseib     Edit/Delete Message   Reply w/Quote
Where can you get them for that? I was looking at summitracing.com and they are more than flowmasters... Also - someone mentioned getting pre-bent rear pipes from MAC - who is MAC?? I bet it would be worth it having all the pipes mandrel bent AND already made to fit out the GT holes (that is what I have)...

Thanks,
Brian

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68DARKHORSE
Gearhead

Posts: 116
From:
Registered: Aug 2002

posted 10-24-2002 02:48 PM     Click Here to See the Profile for 68DARKHORSE   Click Here to Email 68DARKHORSE     Edit/Delete Message   Reply w/Quote
Those are Summit prices. You may have been looking at the stainless steel Ultraflos. You have to compare Ultraflo welded race series mufflers to Flowmaster.

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n2oMike
Gearhead

Posts: 1050
From: Spencer, WV
Registered: Jan 2001

posted 10-24-2002 07:03 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
The MAC mandrel bent tailpipes have two part numbers. The ones listed as 'GT' are #64660, the non-GT are #65649. Their online catalog has the GT pipes pictured. It is at the following address.

http://www.macperformance.com/2000autopdf.pdf

It's a BIG file, and might take a bit to download. They are shown on p. 18 on their catalog. (It has 36 pages)

You can call... 1-800-367-8846 for tech and order info. They are listed at $159.50

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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