I believe Metalmilitia had 3" exhaust if I am not mistaken. The Needswings exhaust can be purchased with or without the cutouts, and they have some very nice proven gains. If I remember correctly, XRay gained 3 or 4 tenths in the quarter with the NW exhaust. That is pretty awesome for an exhaust. Oh, and Metal's exhaust will give you goosebumps it sounds so good.