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Author Topic:   2.5" or 3" Exhaust
Big D
Gearhead

Posts: 6047
From: WELLS, NEVADA USA
Registered: Nov 2000

posted 08-21-2002 02:16 AM     Click Here to See the Profile for Big D   Click Here to Email Big D     Edit/Delete Message   Reply w/Quote
I am going to order new exhaust for my '66 Fastback... I now have the 302 with Hedman Long Tube Headers...

I was thinking of going with 3" Dynomax Super Turbos and 3" exhaust to the GT Cutouts..

Is there much of a performance advantage of going to 3"...

Will 3" fit properly...


------------------
Don
'66 Brilliant Blue Fastback
302 with 5 speed

We Will Never Forget
Keep The Faith America

[This message has been edited by Big D (edited 08-21-2002).]

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mustangboy
Gearhead

Posts: 1147
From: Ont, Canada
Registered: Mar 2002

posted 08-21-2002 09:53 AM     Click Here to See the Profile for mustangboy     Edit/Delete Message   Reply w/Quote
Unless you have a very radical 302 I don't think the 3 inch will be neccesary.Its also a little difficult to fit under the car with good clearance around everything.The tailpipes are very difficult.If your engine is fairly stock I would use a good 2 1/4 or 2 1/2 system with mandrel bent tailpipes.

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TomP
Gearhead

Posts: 6120
From: Delta BC Canada
Registered: Dec 99

posted 08-21-2002 12:47 PM     Click Here to See the Profile for TomP   Click Here to Email TomP     Edit/Delete Message   Reply w/Quote
Yep, anything over 2 1/4" is overkill. The 3" system will be in the way of the rear shocks and probably rattle against everything.

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TomP
Gearhead

Posts: 6120
From: Delta BC Canada
Registered: Dec 99

posted 08-21-2002 12:49 PM     Click Here to See the Profile for TomP   Click Here to Email TomP     Edit/Delete Message   Reply w/Quote
I just installed the Flowmaster American Thunder 2 1/2" system on a 66 Mustang here yesterday, it fit great. It uses rubber biscuits on the hangers like a late model car.

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RADRIDE
Gearhead

Posts: 305
From: Va.Beach, Va.
Registered: Aug 2002

posted 08-21-2002 03:34 PM     Click Here to See the Profile for RADRIDE   Click Here to Email RADRIDE     Edit/Delete Message   Reply w/Quote
I have 2.5 inch going to GT cut-outs in the valance and it is very tight.Plus too much is not always the best in an exhaust.2.25 would be enough for most V-8 ,but 2.5 looks good through cut-outs.

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Big D
Gearhead

Posts: 6047
From: WELLS, NEVADA USA
Registered: Nov 2000

posted 08-21-2002 04:28 PM     Click Here to See the Profile for Big D   Click Here to Email Big D     Edit/Delete Message   Reply w/Quote
I think you guys are right about the 2.5" system... I was leaning that way anyway...

Now the old discussion of Mufflers... Alex always says to use a certain brand... Flowmasters are always a good choice,,, but I like what I've read about the Dynamax Super Turbos... I have 2" Flowmasters now and they resonate pretty bad in the car,,, I would like something a bit quiter with good performance...

Any comments

Don

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Scott (69Mach)
Gearhead

Posts: 796
From: Walnut Creek, CA USA
Registered: Jun 99

posted 08-21-2002 04:49 PM     Click Here to See the Profile for Scott (69Mach)   Click Here to Email Scott (69Mach)     Edit/Delete Message   Reply w/Quote
I've got 3" into X pipe and Dynomax Race mufflers (to use the term muffler loosely, they're basically a straight pipe with loose packed fiberglass wadding). It resonates, rumbles, and sets off alarms. But heck, it's a fast muscle car, it's supposed to be loud. Loud exhaust is like having tribal tatoos on big biceps. Ya gotta have one if you have the other.

The Super Turbos would be a good choice if your biceps aren't as big.

Scott

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Big D
Gearhead

Posts: 6047
From: WELLS, NEVADA USA
Registered: Nov 2000

posted 08-21-2002 05:02 PM     Click Here to See the Profile for Big D   Click Here to Email Big D     Edit/Delete Message   Reply w/Quote
Scott,,,

Having big triceps is one thing,,, but when you live in Rural Nevada you spend more time traveling a couple hundred miles than you do entertaining the masses on main street... Finding a muffler that is just a bit more mellow would fit the ticket...

To be quite honest with you,,, biceps aren't the muscles I'm concerned about...

Don

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'69Stang
Gearhead

Posts: 205
From: Detroit, MI USA
Registered: Jan 2002

posted 08-21-2002 05:18 PM     Click Here to See the Profile for '69Stang   Click Here to Email '69Stang     Edit/Delete Message   Reply w/Quote
I had great luck with the Dynomax Race Magnums - quiet at idle, strong at WOT.

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Scott (69Mach)
Gearhead

Posts: 796
From: Walnut Creek, CA USA
Registered: Jun 99

posted 08-21-2002 05:36 PM     Click Here to See the Profile for Scott (69Mach)   Click Here to Email Scott (69Mach)     Edit/Delete Message   Reply w/Quote
Two words: Ear Plugs.

They work on the Harley just fine. No reason they won't work in Nevada as well. They also reduce spousal interactions when needed. Nothing like turning to your marital unit and shrugging because you can't hear her nagging you about painting the house as you drive on down the road.

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Gearhead
Gearhead

Posts: 2177
From: Brisbane, Australia
Registered: Mar 2000

posted 08-21-2002 06:33 PM     Click Here to See the Profile for Gearhead   Click Here to Email Gearhead     Edit/Delete Message   Reply w/Quote
I put the 2-chamber Flows on my 79 Pace Car with an H-pipe and stock style headers, and it's LOUD. We took the car on the trip to Saskatchewan and back, and thankfully the luggage and camping gear muffled it down to a dull roar. Without the stuff in the back it gets a bit irritating after a couple of hours on the highway (3.73 gear and T-5 tranny puts it right in the "drone zone" at cruising speed).

My last Mustang had Dynomax SuperTurbos... very nice. Deep rumble, opening up nicely under WOT. There was a bit of resonance in the car at about 1800-2000 rpm, but nothing compared to these Flowmasters. If I was using the car more for longer trips (over 2 hours at a time) on a regular basis I would be dumping the Flows for a set of SuperTurbos. JMHO!

On the other hand, maybe I'm just getting old...

------------------
Cheers,
Ian
M&M Member #395
-------------------
'79 Mustang Indy 500 Pace Car
Ian's Pace Car Website
Vancouver Island Mustang Association Website
Indy Pace Car Registry of Mustangs Official Website

"A friend will bail you out of jail after you do something stupid... a real friend will be sitting beside you saying 'That was SO COOL!!'".

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Rustang
Gearhead

Posts: 821
From: Clarion PA
Registered: Nov 2000

posted 08-21-2002 06:43 PM     Click Here to See the Profile for Rustang   Click Here to Email Rustang     Edit/Delete Message   Reply w/Quote
Here's a good chart for pipe sizing based on engine horsepower.
http://www.flowmastermufflers.com/web10/PDFs/Truck_RV.pdf?39,13

------------------
'68 mustang 351 clevor- [email protected]
'67 Stang, 351W [email protected]
'69 351C [email protected]
'78 Pickup [email protected]
'79 Pickup 460 ET=??

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n2oMike
Gearhead

Posts: 2831
From: Spencer, WV
Registered: Jan 2001

posted 08-21-2002 06:50 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
If I were planning the exhaust on another street/strip car, here's what I would do...

1. Install 3" exhaust back to a set of 3" mufflers.

2. Install a set of 3-bolt header collector rings to the outlets of the mufflers to allow tailpipes to be bolted on and off. They can be connected to the mufflers with simple header reducers.

3" tailpipes won't fit on an early stang. 'Muffler shop' 2.5" tailpipes will get crushed all to hell in making the tight bends required to go up and over the rear housing... but Flowmaster sells mandrel bent 2.5" tailpipes for early mustangs for $99/pair! Use these.

This 'convertible' exhaust is the ONLY way to go. The tailpipes can easily be taken on and off... plus, the removable tailpipes make it easy to remove the rest of the exhaust system in case you want to run open headers.

There isn't much muffler room under early mustangs. You won't be able to use mufflers that are very long. I use a center in/out Edelbrock unit. It's part #5525, and works really well and sounds great.

Of course and offset outlet muffler would work best with tailpipes. Choose your own flavor of muffler and have fun.

This system will keep you from getting bored, as it will allow you to change the exhaust system with your mood.

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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Big D
Gearhead

Posts: 6047
From: WELLS, NEVADA USA
Registered: Nov 2000

posted 08-23-2002 11:30 AM     Click Here to See the Profile for Big D   Click Here to Email Big D     Edit/Delete Message   Reply w/Quote
Mike,

Sounds like you need the Flowtech Warlock... They have an exhaust bypass built in.... A freind of mine put them on his PU and really likes them,,, especially when he heads to the track...

Has anyone used the Flowmaster Delta Flow 50 Series 3 Chamber mufflers...

Don

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68 S-code GT
Gearhead

Posts: 3221
From: Sayreville, NJ, US
Registered: Mar 2000

posted 08-23-2002 06:36 PM     Click Here to See the Profile for 68 S-code GT   Click Here to Email 68 S-code GT     Edit/Delete Message   Reply w/Quote
Does this system hook up to stock manifolds or headers?
quote:
Originally posted by TomP:
I just installed the Flowmaster American Thunder 2 1/2" system on a 66 Mustang here yesterday, it fit great. It uses rubber biscuits on the hangers like a late model car.

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