4" mufflex exhaust

[CYA SVT]

just resived my hooker LT's...does anyone here have or know anyone using this setup? or would my slp dual/dual system be just fine? im just worried about backpressure right now if i would be doing more harm than good. car is stock with just bolt on's.. thanks

[Ric]

Screw backpressure!

Seriously, ANY backpressure means the piston is having to push the exhaust out of the chamber, and that costs power.Even with stock internals, the LS1 has high torque/hp peaks... torque peaks at 4400 rpm. That high, you don't want ANY backpressure. With the stock cam, you shouldn't have a problem with the exhaust being so efficient that it sucks the intake charge through the overlap in the valves, so I say run with your 4" Mufflex.

I helped lay out a 4" exhaust on a 3rd gen, before there was Mufflex, and the car shook the ground at idle. At 7000 rpm, though, it sounded more like it was singing happily, instead of straining a nut to keep going... but don't tach 7000 rpm with your stock LS1.