GFB Under-Driven Crank Pulley for Subaru WRX/ STi (2014)

The Go Fast Bits 3-piece underdrive pulley kit includes crank, alternator, and power steering pulleys, along with the required belt. Crafted from aircraft-grade 6061-T6 aluminum, these lightweight pulleys reduce crankshaft weight, resulting in quicker acceleration and sharper throttle response, much like a lighter flywheel. This kit offers up to an 85% reduction in rotating inertia, making the engine feel more lively and eager to rev, without causing engine damage or negatively impacting accessory performance.

Vehicle Fitment:
2014+ Subaru STi 2014+ (EJ25 Engine)
2008-2013 Subaru STi
2008-2014 Subaru WRX

Purchase Includes:
Alternator Pulley
PS Power Steering Pulley
Crankshaft Pulley
Belt

Features:
• Improved throttle response and acceleration through significant reduction of rotating mass
• Engine feels more free-revving
• Under-driven kits offer more power through reduction of parasitic losses from the accessories with NO adverse affects on their operation

What is an Underdriven Pulley?
Underdriven, which means the accessories are driven slightly slower to reduce parasitic losses. It should be noted that our underdrive pulley kits do NOT adversely affect the operation of the accessories. If they did, we would not sell them!

Also Fits:
SUBARU GT MY03-06
SUBARU GT BL-BP EJ255 MY06-09
SUBARU GT BL-BP EJ20T MY03-06
SUBARU GT BL-BP EJ255 MY06-09
SUBARU XT MY09-13
SUBARU XT MY09-13

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