I need help...I noticed while installing my bodykit that (oil?) is leaking from the valve caover on to the heat shield for the headers. I've also noticed a severe dropoff in performance at high RPM's (around 6300 or so) My dad says i might have a bad head gasket, is there any place where i can buy performance headgasketts or what is the problem? Is it fatal? (also i always seem to always be short on oil)