Ohhh guess i touched a nerv, well just talked to Cass from DD again today because i want to get my 9500 reconed with composite cones for SQ and he told me again that there is no major differance if i was to get the 4ohm coils the suspension would be the same as they both would be composite and in the motor the main differance is there are less cooling vents in 9100, So lastley if u wanna confirm ask for the night janitor Cass.