i want high flow cats, looking to increase sounds a little. but...
long tube headers are illegal
tampering with stock cats in any way, is illegal
running without a muffler is illegal
and yep you guessed it, high-flow cats are illegal

honestly WTF?

 

LT's are illegal if you get caught with them, tampering with cats is illegal if you get caught, no muffler is illegal if you get caught and high flows are illegal if you get caught. Get it smogged then it's not due again for 2,3,4 years? Then do what you want. Ricers with fart cans and NOS stickers on their cars will most likely get pulled over and inspected before you. That's what I'm gonna do at least. I have an advantage though. Being military I can register mine out of state if I need to.

 

yeah Cali is way too strict, I love PA haha

 

yeah i want to put high flow cats on. i guess ill just get it inspected then do it right after.

 

what about just cuting the rear 2 cats? with this throw a CEL? my 2004 has 4 cats, and if i cut the back 2 will i be okay? or will it cause a CEL and make my echaust smell like @ss??

 

If there are no O2 sensors behind those cats, then you'll be fine. You may notice a low end power loss. I did the same to a truck several years ago and noticed the power loss immediately.

 

Its not that they are illegal. These cats just arent certified by the state yet. Thats All!