OK...I performed quite an exhaustive search on this site & elsewhere on the internet and I'm pretty much settled on running some type of quality coated headers back to a dual 2-1/2" exhaust with H-pipe and to smallish mufflers which dump right before the rear axle. This is to support a 383 which does not even exist yet, but I will be building it in the hopefully not too distant future.

My plan was either to grab some of the Summit Racing aluminized pipe and run it myself or pay a shop right around the corner from my house to do it. I went there for a quote today and was told very matter-of-factly that on the earlier 80's Camaros you can run duals, but not on my 91 RS. I know a few people on here have done this, but to my knowledge these were earlier than 89 models. Do you guys think I can run this dual setup? I'm at stock height now, but plan on a 1" drop at some point in the future. I thought it looked possible, but not I'm somewhat doubtful.

 

On my 90 firebird I run dual 2 1/2" with a H-pipe but my mufflers are at the back of the car they are 50 series flowmasters. the car sounds great and I have a lot of ground clearance about 5 1/2". The mufflers look good from the back of the car. One thing that made the exhaust install easy as it was that I went under the rear axel with the pipe. a friend of mine did the exhaust the way you are wanting to and he had 3" of ground clerance (not enough).I like that people are putting dual exhaust on thirdgens any car that is deemed fast or powerful deserves a dual exhaust system

 

How do you have that much clearance? Does your car ride about 3.5'' higher than stock? Because I had the exact setup he is wanting to get and it was way to low. It was only about 2.5'' off the ground. It sucked.

I ended up driving up a small incline which had a manhole cover.....The cover ripped half my exhaust off at the header. So now I am running shorties and a 3'' exhaust. Much better.

 

first I dont run the mufflers before the rear axel. I run them where the stock tail pipes go this saves a lot of room and it looks cool as hell. I also run a set of long tube headmen headers and I went OVER the trans crossmember. the right side is in the stock location and the left side is ran next to the torque arm with plenty of room. both sides go under the rear axel with room to spare. I could have went over the rear axel but my car suqats hard on launch so the pipe would get sqashed on the left side. the car is stock hight but even if you lowered it 1" it would have room still , and it would be drivable. besides a F-body is not a truck it doesnt need to clear a stump

 

Sadly, going over the crossmember isn't an option with an automatic.

 

Hmm...so what would be the section of pipe most susceptible to getting banged while driving down the road? If I run a 2-1/2" ID pipe under the trans x-member, that'll kill a lot of clearance, but would I be even worse with the mufflers in front of the axle? I now have that 4x4 kinda look with new springs, struts, etc...so I do have a bit of clearance (and handles well with all my other suspension mods even though I DESPERATELY need an alignment). The roads themselves down here in south Florida are pretty smooth, but the transition in and out of parking lots is typically steep. I can *sometimes* scrape my radiator air deflector even at stock height when leaving the 7-11 near my place.

 

If you use Hooker LTs, the collectors will probably be the lowest part of the system. The Hedman LT headers are higher up against the floor and the pipe over the frame rails or crossmember will be lowest.

 

Thankee...I'll do my research on the LT's and see how it turns out.