Originally Posted by GIdriver
Really? Well that sounds like a lot for a pulley in our cars.
Believe me I was super surprised when I saw the gains. I went to EAS to get them installed. We did a baseline dyno, installed the pulleys while the car was still strapped down and did a after dyno. We did 3 runs that consistently showed a peak 16-18whp gain. the gains weren't only at the top end but through out the entire power band. Tom & Steve of EAS were there along with a couple m3post members