hey guys..im a noobie and i was wondering.. wat is the best way to upgrade ur exhaust system without cops noticing and getting great performance... must we always use at least one cat? doesnt the cat slow the car down??

The best exhaust would be one that flows the best. Usually that would mean running test pipes and high flow mufflers. But then , it would also, increase your noise level. If you are going for something that will pass smog or a visual inspection, gut your cats out. This is not legal, but it will improve your airflow. Search around for some exhaust kits that are built systems that are also carb legal. Many of the larger companies have CARB certification, this means if you get pulled over, you show them the certificate and the exhaust is deemed legal. You don't want to be getting exhaust tickets all the time, they are costly and a pain in the ass. You have to remove your entire exhaust (think: labor costs) then you have to get them signed off. Then if you want, put it back on and get pulled over again. :D

I depends on the emissions laws in that state but you might be able to pass with only one cat for the visual inspection. You can gut the cat but cats don't really hurt performance that much. I've seen only a couple horsepower gained from removing a cat. As far as exhaust systems, you could get the Greddy Evo. It will pass noise ordinance (94 db) and (with at least one cat in place) it should pass emissions.

Depends on which forum you're posting this question in ;)

jason

the bone stock WRX comes with 3 cats right. so ill just remove 2 of them and leave one to pass smog,... good plan?