exhaust and cat

[Rick Johnson]

For the custom cat back people and people with premade systems, if your running 2.25" is that pipe crushed bent or is it mandrel?<p>
My stock exhaust is broken and is really loud but still sounds good I just bought a n1 style muffler with silencer and 2.5" inlet. I'm going to go 2.5" mandrel bent all the way. Even tho i have a 92GS and the larger pipe can hurt performance, I plan to swap to a 2.5 in the future. Where I live emissions are not a concern, has anyone hollowed out there catalytic converter? any performance gains? and how did it sound, because basically you are creating a resonator. or should i just remove the cat and run straight pipe no resonator? Or will that be to raspy?

[lazzyie]

run no cat, gutting cats doesn't help, you will lose low end if you go 2.5 on a 1.8 v6.

[aaronthehic]

but if your going for a 2.5L than you could run 2.5" off the flex pipe back <p>or I ran a 2.5" flexpipe back and the ze seemed to like that

[Rick Johnson]

Aaron, is you exhaust system mandrel bent or crushed? also, what mods do you all have, I'm curios to see what it takes to get a ze in the 13's.