I know SP engineering makes those tubes for $499.00, I am going make my own under $250.00, not hard to do. I will be yanking off my intake and powder coat it along with changing the exhaust to quick silver with no cats. I found a way to make my own plug wires...instead of buying the oem for $899...geesh! i got a carbon fiber plenum cover for undr $350.00...lambo chrges over 2K for their covers. There's tons of stuff I am already going to do at the fraction of the cost. I will also be yanking out my own engine to replace the OEM clutch with a Kevlar clutch..while it's out I will be spiffing up the bay..I'll take pics.