Originally Posted by SDGenius

Just to clarify, in California aftermarket/altered OEM cats are only un-auth for OBDII equitped vech. older cars w/OBD1(in other states this goes for OBD-I & II) can have EPA(Federal) approved aftermarket cats after 8yrs, 80,000miles or stock cat faliure(the excuse everyone uses). the Kinetix cats do use catalizers that meet all FED/EPA requirements and will pass a sniffer. so, they're pretty much legal in every other state BUT Cali because we have CARB here. I personally have the Kinetix cats and live in Cali, i had them installed at SMOG station. they where cool and said they didn't care as long as they met FED reqs and could pass sniffer. i really like the kinetix cats, they're way lighter and ofcoures have way more flow and are even cleaner. so yeah, i like 'em and recommend them. for those of you havin' probs passin' emissions livin' in Cali, you can get a 2yr grace period when you don't have to have pass SMOG... IF you fail and it'll take more than $400 to repair. some people ride these extentions for years. If ur runnin' HFC(in Cali), i say talk to ur local test stations and see what's up. if worse comes to worse just bolt the stockies back in. as for COPs on the street, as long as ur not runnin' some crazy polished cat set up you should be fine. if ur that worried about it weld up ur OEM heat shields or just gutt an extra OEM set. all i'm sayin' is, our cats are bolt-on's. it makes it pretty easy to take advantage of 'em.

Originally Posted by RedSkylineGT

So I have a 03 with 90,000 miles on it.(10,000 on new motor).. I can legally change my cats?

Originally Posted by bobshuai

we need more input from everyone now, this subject is getting interesting.

Originally Posted by RedSkylineGT

So I have a 03 with 90,000 miles on it.(10,000 on new motor).. I can legally change my cats?