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ok; im runin a 07 m8 stock 162 with 14-1 rkt head 5000' 75 gr lite tips stock yel/wte primary rkt 36 ,red/wite torsional settup. middle hole 40-42 mph 7500 ,stiffest setting 7800 38-40 mph and tore threads out of the belt, soffest 7400 41-42 mph. stock settup was same primary 44/40 orange same hill 41-43 mph no head. so im confused ive spent 750 $ on chit that was no better than my stock settup. am i missing somthing or any body have any ideas on wat to try. i put the kit on my boys m7 and it made a big differance in aceleration. he can kick my azz.