I got a fmf fatty with a turbinecore 2 on my blaster, Im a salesman at a local motorcycle shop, but when it comes to mechanical stuff im pretty retarded so i got my service guys to install it and jet it for me...Ive had it on for about a month, and where the pipe is attached to the engine with springs there is a wet black residue around it...if i ride i get these black spots all around my ankles from this stuff coming out...also when i rev the engine it kind of pushes the pipe away just a little then it snaps back...just wondering if this is normal