Noooo...the "cat" helps to control emissions. I personally think they suck, and hurt performance, but there are some for high HP applications that help. But anyways, they're different. If your car doesn't have one, don't add one. If it does, oh well. Suck it up, there are alot of aftermarket cats that will help increase performance, but I don't think they're worth the money. Especially for a daily driver.