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The Kartboy Crank Pulley is a great way to increase performance without any sacrifice. Decreasing rotational mass reduces the strain on the engine. The lightweight crank pulley has the same effect as a lightweight flywheel, just not as dramatic.  ..

The Kartboy Subframe Lock kit is engineered to lock the rear subframe in the WRX. It prevents the rear subframe from moving under heavy lateral loads. Which will change the alignment settings at that moment. This kit includes 2 bolts with 2 sleeves, a simple install. It is probably one of the eas..