GrimmSpeed Lightweight Crank Pulley for 15-21 WRX / BRZ Royal Purple Many automakers and car owners

Many automakers and car owners use AGM batteries for the increased starting demand of modern cars with start/stop feature

offering robust reliability for street and track use

(1) Sandpaper

This system does not add fuel and is intended to be used with an engine management system that can add nitrous enrichment fuel through the engines injectors

GrimmSpeed Lightweight Crank Pulley for 15-21 WRX / BRZ Royal Purple Many automakers and car ownersThe GrimmSpeed Lightweight Crankshaft Pulley for FA20 2015+ WRX, BRZ, FRS and 86 models is a lightweight replacement for the OEM crank pulley to decrease the overall rotational mass. The GS pulley weighs only 4. 4 pounds, 1. 1 lighter than stock. Available red or black. Vehicle Fitment: 2015 2021 Subaru WRX* 2013 2020 Subaru BRZ * Note 2019 2021 WRX will need an additional OEM backing piece Features: 75% Reduction in Rotating Mass Weighs 1. 1lb vs the