I want to find out which is better option to keep the car emission legal. With header which I believe removes 2 cats, or race or downpipe which should remove one cat. Does anybody have experience with header or downpipe?
thanks

 

i don't recall seeing any pipes of header for the GS that's street legal

 

if thats the case, for next mod do you think that I should get a TC? I heard good stuff about it. Will it make everyday normal driving worse? I saw some info that with higher stall speed, the car will not launch until the stall speed is reached. My normal driving is not too radical. So I don't want to be reving to 2800 or 3000 rpm before launch everytime. Is it true?

 

i'll assume you have OBDII
cars with OBDII have a o2 sensor before and after the cat. OBD I cars only have a o2 sensor before the cat
removing the cat will more than likely cause a check engine light to come on because the second o2 sensor see's no difference in emissions when it should.
there are wayz to fool a o2 sensor tho...

 

well, I just want to know if there is anyway of making the car emission legal with possibly replacing header or just the race pipe. I hate to replace and reinstall header everytime when emission times comes you know. I want to get 10 or 15 more horses without going forced induction.