Originally Posted by TVT_DESIGN
The crank pulley is also the Harmonic balancer on the N/A so a different size may not be cost effective at this point. Typical gains are 12-18HP depending on mods. Throttle response is greatly increased and you can expect about 3-5% improvement in gas mileage.
Got the dyno to show the HP gains?
I know LET showed a dyno on a stock c320 when they finished their under drive pullies...
If its dyno proven, there is no way you any NA user shouldnt buy this thing :x 500 bux? itll pay for itself in improved mpg!