[bull]

do you have the Helix or Linhai engine clone?

have you done all the maintenance and drive it from its winter slumber?

the boost bottle, are you saying you installed a nitrous kit? If yes,was it a dry or wet kit? what orifice size are you using?

EDIT: where the muffler attaches is agasket within the pipe, also if that clamp bolt is loose it willleak exhaust and be noisy.