Based on what I've read, it does cut out based on speed. I recall somebody disconnecting the speed sensor and getting higher top end - but no factory speedo data.maybe im trying something that wont work. the clutch has a nice shift curve. i was wanting to lower the rpms a little,make it shift alittle faster. i thaought by watching the tac it was cutting out when i got to 6050 rpm. so i thought if i added weight so it didnt hit that rpm so soon i would get higher top end.but reading on here maybe it speed that cuts out?