do you have the ninja pipe on not the os pipe get the ninja it smooths it out and makes moreee yes i said more power also try a p4 plug
next summer when i got a job and back racing nitro it be ptm ninja for me
shane racer and curt may kevin wilson all said the ninja sucked till i got mine and they were like god danm that a lil to much motor and i yet to see it top out even on 250 foot strightaway