For those of u out there that are wondering if increasing the size of the piping actually makes a difference, it actually does a little(at least increasing to 2.25" on my 2.2CL did). Not as much as a header or a straight pipe would do though.

I was on the freeway on my way home just now it was like 2am. A 4th gen accord with a bodykit/moose spoiler/muffler etc. zooms passes me so i decided to tryout my setup. I was going around 80. I shifted into 3rd gear and caught up pretty quickly with the accord. we pulled even for a few sec. and I start pulling away at around 110. I was about 4 car lengths ahead when i hit 125. So There... i guess my muffler helped a little after all... i used ot top out at less then 120.

that was with my friend on the car btw....

 

nice kill did u just hang the muff on ur stock pipe before u got the catback?