My brother works for R&D at an after-market car co. He said once I get my Sky he can build a prototype for an exhaust and then they can mass produce them. Has anyone bought an exhaust yet, and if so how much did it increase the HP? What company did you buy it from? Any feedback on what you guys would like to see in an exhaust would help. My bro has worked for almost all the top racing companies, so he can build pretty cool stuff.