2fast4u1989

looking to do longtubes on a 94 lt1 firebird formula. was looking at the new speed engineering kit. would also like to run true duels instead of a ypipe/single. question is do i have to run an x or h pipe, or can i just run pipes off the headers all the way back? thanks guys.

ahritchie

iTrader: (1)

Why not just dump them in front of the axle? Might be a bit loud for a DD, but less weight, easier, and probably sound pretty nasty, mufflers optional! Also cheaper!

2fast4u1989

i would consider dumping before the axle. i was wondering do i have to run a x or h pipe or can i just run two pipes?

Catmaigne

iTrader: (6)

You could want some sort of crossover to help with scavenging, it will probably run like crap otherwise. X > H.

350 groundpounder

iTrader: (5)

H pipes make low end torque which is good. Don't think you have to have it though. Dumps without sometype of muffler would be annoyingly loud!

SilverSS07

iTrader: (1)

Might gain a few hp with a x or h pipe but it is not necessary.

big hammer

I have the ebay true duals with bullets and dumps on my ls1. it has a fantastic sound but is a little noisy in the cab.

Jr.Samples

I had an old 79 T/A I used to run header mufflers back in Indiana. They bolted right up to the collectors and I had them dump before the rear axel. Worked great and would do again if not for state inspection in Texas.

fbody_brian

This is how I had my 79 formula, two turbo mufflers that bolted directly to the collectors. Sounded fantastic! wish there was room under the 4th gen to do that, but I don't think they'd fit there.