acasanova

why dosent it make sense ?

f1nch

yea i think im just gonna order a borla muffler and throw a 3in. straight pipe all the way back.. no cats... im gonna lose my low end but i only need the power up top ....thats where you race anyways soooooo yea now if we could only get a CAI i'd be campin happy ......

200hpTC

i went with 2.75 and no cats cause my headers eleminated the front one.....you will throw the check engine light tho.....see mods below

Souljah347

my bad, i thought he said to to with 2.75 cause 2.5 was too big... damn i need to get my eyes checked or something

whtonblktc

2.75 is huge... im runnin 2.25 and thats perfect.. im gettin ready to run a hi flow cat becuase i got the megan cat back soo.. im gonna run a hi flow cat with an s pipe to go along with the headers and intake and exhaust.. i wouldnt run any bigger then 2.25... most jap motors need back pressure

soros151

I got 2.5", now that's perfect, and almost none rasp. My piping is right from the header. No cats. Very good.

XD40tC

I say no cat! I dont have one. Well I still have the manifold cat but that will be gone soon as well.

Chops

You need the CAT for CA holmes, just get a Magnaflow hi-flow cat, I'm gonna get one sooner or later.

A silencer won't do jack when you go to get a smog-check. The catalytic-converter is used to cut down emissions, if that's not there, you'll fail your test with more than flying colors.

My pipes are 2.25, that's plenty for my setup.

xSTANDxSTRONGx

^^^What he said, as well as a bunch of other people on here. Be smart, get the Hi flo cat, at forget the 3-4hp (Made up #'s) and remember all the money you'll save on the Smog tix and poss 2,500 for messin with your cat.