It is now shaped to look exactly like the factory For Subaru pulley, so it goes unnoticed in your engine bay - it even uses the factory belts. A significant amount of weight has been removed from around the rim for even better throttle response. The GFB-29 pulley now weighs in at 578g (previously 79g), compared to the factory 218g on the WRX and 2575g on the STi. This pulley will improve throttle response (particularly off-boost response) and allow the engine to rev more freely in the upper rev range. It suits ALL For Subaru EJ-series engines, and does not require additional belts.

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