the ws6 has 51k miles and is a a4, the car put down 286rwhp and 278rwtq bone stock, so i went from there. put on a set of Pacesetter L/T's and Y-Pipe, SLP loud mouth, SLP lid, SLP ZO6 MAF, FAST 78mm TB and Intake and Crane Cams tune. the car then put down 330rwhp and 333rwtq. But the car felt sluggish on the low end with the intake so i took it off, making the same numbers with the LS1 intake, I recently put MTI lid, LS6 intake, and NX Stage 1 kit and made 427rwhp and 444rwtq on 100 shot and then 453rwhp and 530rwtq on a 150. So im hoping to make a little more with the LS6 intake. My cobra is bone stock with Magnaflow Cat-back and i plan on keeping it that way.