I used to be of the redneck mind set that Cats are evil and thats that. In reality, high flow cats are not very restrictive, DO lower emissions(if you think thats a nonissue you must breath different air than me) and in MANY cases actually increase power output. People don't get that stock or mild motors, need backpressure to make efficient power. Cats provide just a little bit more to a fairly unrestricted exhaust and will help out. I say go on Ebay search for whatever size pipe cat you need and buy some, I think you can get 2 for like $100.