I have 40s flowmasters welded in, sounds tits. I will be going with a Kenne Bell TS1000, all the research I have done on them, they can't be beat. The torque curve in awsome. Quiet and efficient. Really upgradable. You might end up paying a little more for it though, I was originally going to go with a Vortech, herd a lot of good things, but seeing results from the Kenne Bell, I have no choice other than to spend a couple hundred extra dollars and do it right.