the arms were not adjustable! there was provision to mount the arms in a different position but they were unusable without major surgery!!

i had a 500 for about 10 years and can honestly say that the lag was never an issue, the punch in the back from the bigger turbo was much more of a thrill than driving the saph, it was also easier to drive around town as it did not want to jump towards the red line and on the track it flew as long as you used the gears!!!