Join Date: Oct 2013
Location: Costa Mesa, California
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You will notice some power gains from the Pulley upgrades. The Underdrive Pulley will get you the best gains because it free's up more power that is normally used to drive the accessories.
The main reasons to stick with the Standard Sized Light Weight Pulley are:
A) You are running a large aftermarket Stereo system that draws a lot of power.
B) If you are planning on going with a Supercharger later on (the underdrive will under power the supercharger if used).
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2016 Q50 Silver Sport - Majestic White on Black - | STILLEN | RSR | Vossen | Nitto |