[Redog]

He in Philly if you have no CAT the car won't pass emissions, as part of Northeast Emissions, but you can do a high flow but don't go too big. It will rob HP instead of gaining it.

20 to 30 HP from hollowing a cat is BS. In fact, even if you remove a cat those numbers are BS. The guy either doesn't know what he talking about or he's trying to rip you off.

Just look at the numbers. A SPL or a Borla cat back will add only about 11 HP. The only way to get 30 HP out of exhaust is to put on headers too. Then your up around the 30 HP range. But this is all a lot more than $60 too. About $600 for the exhaust and $700 to $800 for the headers.