Go Fast Bits Underdrive Pulley Kit Subaru WRX 2008-2014 / STI 2008-2017

In Stock (2)


GFB 08+ WRX/STi / 09+ Forester / 03-09 LGT 3 pc Underdrive/Non-Underdrive Pulley Kit


This GFB Pulley Kit comes with the crank, alternator and power steering pulleys as well as the belt needed for install. Having large heavy pulleys spinning takes away power that is better spent moving the car. This kit takes care of that by replacing the crank pulley with a lighter version that underdrives the power steering and alternator yet leaves the A/C compressor spinning at normal speeds.

Stock Crank Pulley : 5.51lb (STI) / 4.63lb (WRX)
GFB Crank Pulley : .86lb

Stock Power Steering Pulley : .81lb
GFB Power Steering Pulley : .37lb

Stock Alternator Pulley : .36lb
GFB Alternator Pulley : .14lb

Total Mass for GFB Pulley Kit : 1.38lb
Total Mass for Stock Pulleys : 6.69lb (STI) / 5.81lb (WRX)
Mass Savings : 5.31lb (STI) / 4.43lb (WRX)

Alternator Underdrive : 16.5%
Power Steering Underdrive : 18%
A/C Underdrive : None

SKU: 2014


Additional information

SKU 2014
Carb Compliance Yes
Prop 65 Yes
EPA Approved N/A
Weight 1.7 lbs
Dimensions 6.2 × 6.1 × 4 in