Jay Stewart wrote: >Good info. >http://www.dinanbmw.com/html/danger_of_power_pulleys.htm Hey, they're good enough for a 9 second car. ;-) Seriously, Mike has done the calculations for the harmonics and such and determined them not to be a problem for the SR20. George Roffe Houston, TX 91 SE-R (well modded) 91 G20 (well modded) 84 944 SCCA ITS race car under construction <http://home.earthlink.net/~geo3/>