Don't use Blowmasters!!! LOL I have a new downpipe, Magnaflow cat, Ubend delete, res delete, two Flowmaster 40's... I could tell a difference in performance AND sound... I am debating on putting Magnaflow's on inplace of the flow's but I might just put on some turbo's to quiten it down a lil. I have heard that there are not many performance gains removing the stock mufflers for something else. I do love how my car sounds at idle, but through about 2500 RPM it's raspy, but cruising it's mellowed out so much the rumble puts my fiancee and kids to sleep.. LOL Just my $.02...