What about FMF or Big Gun?? cuz i originally had been looking at FMF, Big Gun, and HMF. do you know anything about the FMF mega and power bomb headers?? that is one of the things that turned me on to FMF and i have a good friend who has been racing for years and he swears up and down go Big Gun but idk if that just his opinion becuase its what he ran or if its actual a good brand and also do you knwo anything about the curtis sparks x-4 or x-6 full systems??