Spul Engineering releases their SSP (super spool pulley) underdrive pulley kit for the 2.0 TSI motors
Underdrive pulleys are a popular way to extract a few more horses out of a motor. Essentially, by underdriving accessories such as the alternator, power steering pump, and a/c compressor, horsepower being drawn from the engine can be freed up. It is only a few more horses as the power gain for the part is claimed at 5-7 horsepower. Yes, not much power but for guys trying to extract every little bit to get that edge it is certainly an area to look into.
Especially considering the pulley only costs $199. It is made out of aluminum and at 16 ounces lighter than the factory pulley at 64 ounces.
Where is the dynograph though? Horsepower claims on paper are nice and yes underdrive pulleys do free up power but this website expects claims to be backed up.