the 7 hp is from adding the filter to the pulley not the pulley itself. you need to measure the pulley it should be 65 mm. anything else is the midsize pulley meant to be run stacked with a 178.
check the spacing of the pulley. you may have it spaced to far out and its not engaging properly. you want it as close to the clutch without touching anywere on the clutchpack
AND DJ THE BLACK COLOR IS GOOD FOR A SOLID .2 FASTER TIME. cmon you know you want one!!!!
and lastly buggin had a c3 filter during the dyno tune session. he pulled bigger # than most of the srt-6's and 32's there. and he backs it up with a 12.1 timeslip!!!