Installed the raby under-drive pulley

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Originally Posted by Jake Raby

Despite any actual values, this mod is one of the few that can be felt in the driver's seat.
I see 5-7 HP at the wheels and a torque increase of generally 5 lb/ft after the installation on my dyno. What should be more considered is this mod creates more power across the ENTIRE RPM range, so the average HP is increased and thats a much bigger gain on a stop watch or in the driver's seat than just a peak HP gain.

This really is the key here. An increase of 5rwhp from 3000-6500 rpm is a lot more valuable than a gain of 5hp only from 6500-7000 rpm in terms of lap times. How much time do we really spend above 6500 rpm? Far more useful than the average software reflash at 1/5 the cost. I did it as a reliability mod to preserve my power steering pump on track days but the bit-o-power increase is icing on the cake.