Go Fast Bits Underdrive Pulley Kit Subaru Models - 2008-2014 WRX, 2008-2021 STI

Here, you are looking at the GFB Pulley Kit for the 08-14 Subaru WRX and 08+ STI. This kit consists of a lighter crank, alternator, and power steering pulleys that save weight and rotational mass to improve the engine response.

DETAILS:

• Lightweight aluminum construction
• The crank pulley weighs .86 lbs
• Power steering pulley weighs .37 lbs with 18% underdrive
• Alternator pulley weighs .14 lbs with 16% underdrive
• The total mass of GFB pulley kit is 1.38 lbs
• Mass savings for STI models: 5.31 lbs
• Mass savings for WRX models: 4.43 lbs
• AC compressor will still operate at normal speeds
• Includes new alternator/power steering belt 
• Black finish