i am still looking at different exhaust systems... does it matter what kind of cat converter i get?? i have seen some on ebay for as low as 35 dollars... is that a deal or am i gonna be having problems with it?? i also saw a obx part # CAT104, and it has a lifetime warranty... is it better to just pay the extra thirty and get the obx one or should i keep looking??

Just read the fine print. "for off-road use only" Don't get caught. Usually because hi-flow gives a louder sound and it doesn't pass emmisions test. If you purchase a catback exhaust, you won't need to replace the cat. Unless you decide to purchase a system that starts from the header to the exhaust tip.

exhaust system + hi-flow cat converter = deeper exhaust tone, a little louder, noticeable performance gained.

is it necessary to buy headers to feel a difference??

No, but it helps.

yes, it helps, you'll notice the difference.

if you have stock headers you are robbing the system of its full potential.

Invidia Exhaust System, JDM angled exhaust, Super N1 Design, sounds very nice.

Just read the fine print. "for off-road use only" Don't get caught. Usually because hi-flow gives a louder sound and it doesn't pass emmisions test. If you purchase a catback exhaust, you won't need to replace the cat. Unless you decide to purchase a system that starts from the header to the exhaust tip.

i think it depends on wat state ur from. even in new jersey u can have a high flow cat and u will pass emissions depending on the car, and NJ has strict emissions and sound laws. and yea R34 invidia is a sick exhaust.