Celica Forums General Discussion Engine and Performance Exhaust System...

ok, i just bought a header and full exhaust system for my 00 celim i havent put it on yet and im waiting bc im debating on what to do about my cat..ive been told i should hollow out it out while others say to put a hi-flow..whats everyones opinion?? thanks a bunch

what header and exhaust system do you have?

Hot Shot. Greddy Evo 2

hi-flow, but watch out for that emission test...

No emissions test in FLA i believe, didnt they do away with that??

I say this, because my cousion did a straight pipe on her mustang and i asked her about testing and she said there was none!!

If you're gonna hollow it out, make sure to bypass the O2 sensor that's located after the cat or even if you get a high flow, do something about that O2 sensor. Otherwise, you'll get CEL problems, also I heard that if you hollow it out and have it kind of like a straight pipe, your car may have back pressure problems. Better to have a high flow I'd say.

i ahve never been tested in fla all is great donw here. minus the hurricanses and hot one day, cold the next. damn flroida weather.

I would also go with the Hi-Flow.

btw, Chicago has unpredictable weather. Snow one week, rain the next, warm after that, snow again.

wish we had snow. but not alot, jsut in moderation and not enough for salt on the streets.:)

i was hoping for it to snow this year but it's hot as hell compared to other states...

"Unusually high temperature this time of the year, blah blah blah..."

Yeah, the weather has been really weird here. Snow one day, rain the next, then 2 days later we ar back in the upper 50's!

just keep it you get no performance increase from a high flow/gutted/no cat not to mention your computor wil not like not having the 02 sensor

lol upper 50's i woudl love for upper 50s wehave liek upper 80s on a good day

I think upper 60's is perfect

I thought I'd heard the stock cat on Celica's was already pretty high-flowing? It's there for a reason, so whether you live in a state that has emissions testing or not, do us all a favor and either keep it or replace it with a high flow cat, don't just remove it or hollow it out.