I have a 99 KX125, just put it in the shop to have some maintenance done & jetting done, I ordered an SST and silencer, to my shock they put a Turbine Core on. I am running Delta V-Force reed cage, jetting is spot on, the bike rips from mid to overrev, but is a dog down low. What difference would a Power Core or Shorty Silencer make? Thanks, Dave.