71 delta88guy

There are no vendors for 3 inch exhausts for these cars,correct?

joe_padavano

Not unless someone makes them for a 71 Caprice.

coppercutlass

use and modify an exhaust for a 95 ss impala. I used this system for my dads b body although it is a later shorter 77 b body. usually you can extend the system in the center and since the system usually comes in flanged pieces you can make a nice extension with out all the jimmy rigging. Just a thought.

joe_padavano

Yeah, and except for the different wheelbase, width, frame, floorpan, and gas tank location, it's exactly the same as a 71...

If you're going to cut and weld, just get a generic 3" exhaust kit. A-body tail pipes will probably be close enough that you can modify them to fit. The intermediate pipes will need to be modified for length, muffler style, and position. Head pipes will need to be Olds-specific.

coppercutlass

I was not aware of that .

MDchanic

So, you're looking to flow 1,500 CFM, with an engine making 680HP?

I'm impressed. Tell us more about your build.

Or are you just trying to reduce your performance while making as much noise as possible?

- Eric

oldcutlass

Or..., you can just go down to your local exhaust shop and have one made custom for about the same money and no headaches. My local guy is an artist.

71 delta88guy

I'm quite certain the need is real. Why would someone spend the money needed to go with a 3 inch exhaust and be making 400hp? I'm going to build,install,drive for at least a 1k miles THEN I'll take a visit to a chassis dyno. With the 4l80 I'm using I'd expect some more than usual power loss but I don't care. I'm looking for a nice nasty bulletproof driveline I can beat the **** out of for many years to come.When the build is complete I'll post my combo. I still might change a thing or 2.

Paladin31

FWIW I had the local muffler shop form 2-1/2" front to back, installed, including the mufflers [only flowmasters], I supplied trumpets [for just under] $300