MyLittleBlackBird and I will be installing a 2.5" exhaust on my car next week, and we would like to do a straight shot out the resonator to the rear bumper, directly underneath the gas tank. I've talked to an exhaust shop about this, and their biggest concern is the exhaust pipe rattling against the tank or smashing on the tank if the car bottoms out. I think we could rig up a straight shot without the pipe hanging any lower than the stock setup, but we would be bypassing the exhaust "channel" in the gas tank to do it.

I need to know if anyone has ever done a setup like this in a 92-99, and if so I need pics of it. Does anyone think it would be stupid to run a straight exhaust and forego the use of the exhaust channel under the car?

If there are any generic pics of a 92-99 undercarriage, please post them. They would be helpful for visualizing this setup. Thanks!

lol I've been thinking about that forever. I pretty much have the same questions as you.
I know Harofreak has some pics of his old SSEi'* exhaust setup.

He also has some of mine, front to rear

Biggest question is, what sort of heat insulation should we use? I was thinking just get some of that crappy spray on ceramic coating stuff for the section that goes under the tank, but anything anyone can suggest that is reasonable will be considered.

I was thinking maybe make an aluminum heat sheild similar to the others under the car already.
Maybe bolt it in before and after the tank and have something thin in between the tank and the sheild so it dosen't rattle.
Still have to make it easy to remove for a fuel pump replacement..
Just kinda throwing that out there as it came into my head.
I'm liking the ceramic coating idea if it was of good quality.

what about installing some kind of slef adheasive (dynomat type) heat sheilding directly to the tank, then wraping that section of the exhaust with header wrap?

i think that would work nicely. maybe add some aluminum heat sheilding as well.

ben i got your message before, and i am finally home now, but that means home to my parents house, dont have any access to my pics except whats on my photobucket accounts...

*looks*




i got travis'* underside pics also, but i never uploaded them yet.. however, they should still be on your computer from when i was there.. unless you deleted

HOWEVER, did you know gordy has the full 3" exhaust with magnaflow muffler and the same tips as i had on my 95 hanging in his garage.. if you came up on a weekend to get it, that would save you a lot of money..... its a straight shot back.. . refabbed... not sure if you want the 3" though...

talk to gordy though, he will know WAY more about it personally than my pictures can describe

Thank you for the pics, Andrew! I got your message yesterday, I just didn't have time to call you back. I think I still have your pics, but I'm on a different computer since we just moved out of our Ames apartment.



The plan would be to attach the new 2.5" Magnaflow resonator right after the cat, then go straight back. As you can see in the above picture, the exhaust makes something like a "D" shape to the left, then comes back around to go into the side of the muffler. Our plan is to head straight under the gas tank, bypassing the channel underneath the car.

Marik, I really liked the idea you had about self-adhesive heat shielding combined with some kind of header wrap. I don't know if we would use the header wrap, since it promotes corrosion of the pipe, but I like your line of thinking. Maybe we'll use the ceramic spray-on instead of header wrap on that section of pipe.

What muffler are you going to run and is it going to come out of the middle of the bumper?

As of right now the plan is to run a big Magnaflow resonator and no muffler at the back end. If that'* too loud, Doug has a 2.5" in/out Borla I can use.

Yes, the plan is to keep the exhaust pipes closely-spaced near the middle. I haven't seen any Bonneville owners do this, so I figured it would be worth a try!