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Old 12-25-2012, 06:24 PM   #1 (permalink)
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Default 3" tailpipes

Has anyone been successful at installing 3" tailpipes on their classic Mustang? I know they make prefabbed kits for fox bodies, but it seems like going over the axle would be difficult in my car. Has anyone done it?
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Old 12-25-2012, 08:05 PM   #2 (permalink)
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Yes, I have a tubing bender and you have to work at it a bit--67 mustang coupe. John--Las Vegas
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Old 12-25-2012, 09:12 PM   #3 (permalink)
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I have 3 inch full exhaust... with dumps though, not out the back.
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Old 12-25-2012, 09:25 PM   #4 (permalink)
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Well, I have 3" to dumps, but I'd like to take it all the way out, but I've been told it can't be done. It sounds like at least one person has done it.
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Old 12-25-2012, 10:20 PM   #5 (permalink)
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I have done it but i think the bends were to restricted in the flow of exhaust, but was thinking about buying a bunch of u bends and making my own, just have not done it yet ran it out through the factory exhaust hoke were orginals trumpets went
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Old 12-25-2012, 10:38 PM   #6 (permalink)
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I think magnaflow makes a full 3" stainless kit for the early cars. I bought the complete 2.5" kit for my 73 convertible.
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Old 12-26-2012, 06:04 AM   #7 (permalink)
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I haven't done it, I run 2.5 mandrel bent Flowmaster tailpipes after 3 inch primaries and mufflers, but always wanted to

I made up a very tight curved 3 inch mandrel bent setup for my F100 4x4, basically came out of the headers and ran it down the passenger frame rail, seems to be a much tighter radius than the Mustang would need for a tailpipe

With that being said, the other tight area seems to be along the gas tank on the driver's side.

One of these days I need to get under there with a mandrel bent J like this and see what I can make



Pieces like these are very handy, combine it with a chop saw and you can weld together about anything you'd like
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Old 12-26-2012, 08:06 AM   #8 (permalink)
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I had full 3 inch full mandrel bent exhaust done on my 65 fastback. It was ran over the axle in back and through the rear gt valance holes. The shop that did it is a full custom exhaust shop here in Denver that has their own in house mandrel bender. (Hank's Hotrod Shop).

It fit perfectly (better than 2.5 " systems that I have had done at other shops) because all the pieces were custom mandrel bent in the shop from 3 " straight stainless exhaust tubing. The trick was to use 3 " oval tubing by the gas tank in back for clearance then neck back to 3 " round to go through the valance holes. It had 3 " delta 50 series 3 chamber flowmaster mufflers and it sounded awesome! It also had a custom 3 " x-pipe mid section.

It was not cheap to have this built, but the workmanship, quality and fit of the system was unbeleivable. I will be using Hank again for future exhaust needs.

I have since sold the car (on to the next 3 projects LOL) but if you google "prowler orange pearl mustang fastback" and click on the link for the car sold at Barrett Jackson Las Vegas auction Aug 2012 you can see pictures of the car.

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Old 12-26-2012, 12:25 PM   #9 (permalink)
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I have the MagnaFlow full 3" stainless system on my 68 Coupe. Tail pipes over the axle with turn downs just peeking below the non GT valance.

If you have staggard shocks they say it wont fit,but......
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Old 12-26-2012, 12:52 PM   #10 (permalink)
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Default HP and Exhaust Diameter

Just throwing this out there, 3" support lots of HP. 2.5" is probably good for well over 500HP.



Quote:
Originally Posted by sportsroof69 View Post
Has anyone been successful at installing 3" tailpipes on their classic Mustang? I know they make prefabbed kits for fox bodies, but it seems like going over the axle would be difficult in my car. Has anyone done it?
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Old 12-26-2012, 01:08 PM   #11 (permalink)
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Quote:
Originally Posted by jimeast View Post
Just throwing this out there, 3" support lots of HP. 2.5" is probably good for well over 500HP.
LOL Whats your point?

Ever heard a 430in FE with 3" exhaust come on the cam at 4000 rpm?


Mines a pure toy,no reason for any of it. I drove it from TX to Ca and back. With the windows up,and ac on,you can still hold a conversation with the passenger.
Except at idle and low throttle by any measure it's loud,but even driving like an *** I've had no problem with the law,noise wise. I have 2 naighbors comment that its a little loud so I make sure I don't "crap in my own yard". I fire it up and out of the garage as quick as reasonable then chug off the street at low revs if I head out before 6am.
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Old 12-26-2012, 02:07 PM   #12 (permalink)
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Default What's the point

Only that 2.5" might be easier to fit than 3" and you may not be giving up anything that's useful

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Originally Posted by cyclone03 View Post
LOL Whats your point?

Ever heard a 430in FE with 3" exhaust come on the cam at 4000 rpm?


Mines a pure toy,no reason for any of it. I drove it from TX to Ca and back. With the windows up,and ac on,you can still hold a conversation with the passenger.
Except at idle and low throttle by any measure it's loud,but even driving like an *** I've had no problem with the law,noise wise. I have 2 naighbors comment that its a little loud so I make sure I don't "crap in my own yard". I fire it up and out of the garage as quick as reasonable then chug off the street at low revs if I head out before 6am.
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Old 12-26-2012, 02:27 PM   #13 (permalink)
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Quote:
Originally Posted by jimeast View Post
Just throwing this out there, 3" support lots of HP. 2.5" is probably good for well over 500HP.
Well, I make considerbly more than that, so I'll be sticking with the 3".
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Old 12-26-2012, 04:03 PM   #14 (permalink)
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Yes I have full 3 inch right out the rear GT valence.
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Old 12-26-2012, 08:04 PM   #15 (permalink)
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Something you might consider, is running 3" pipes under the axle. I did that on my previous 70. The only bad part was having to drop the exhaust if I wanted to drop the rearend.
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