quote:

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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

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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

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!

quote:

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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.

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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

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1966 Ford Mustang 2+2
Mine - Restomod in Progress

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

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

Artificial Intelligence is no replacement for Natural Stupidity.

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!

quote:

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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.

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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!

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Originally posted by 68DARKHORSE:
Dynomax sounds and flows better than Flowmaster.

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This is true...

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!

quote:

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Originally posted by bgseib:
And the ultra flows are bit more expensive than the flowmasters...
Thanks guys..

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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!