CP Pistons & Rings 87mm Bore 1.0mm Over for EVO X LegacyGT_2010-2012 the GrimmSpeed BCS will allow

the GrimmSpeed BCS will allow for extremely high resolution boost control at elevated boost pressures

ACT spring retainers utilize wraparound spring windows and thicker retainer stampings to provide spring support

only electrical wire needs to be run to the back of the gauge instead of tubing

This increases both quicker throttle response and higher clamping load to maintain boost pressure more reliably

In stock form the front end of the WRX has a tendency to move around which equates to less then predictable handling

CP Pistons & Rings 87mm Bore 1.0mm Over for EVO X LegacyGT_2010-2012 the GrimmSpeed BCS will allowPart #: SC7222 From Drag to Endurance CP pistons have proven their quality in the racing community. These pistons for the 08 10 Evo X are avialable in 86mm stock bore, 86. 5mm w 0. 5 overbore, or 87. 0mm w 1. 0mm overbore and retain a 9. 0 compression ratio. These pistons are designed for high horsepower applications and are much stronger then OEM due to the forging process CP uses. The CP pistons for the Evo X 4B11 are an excellent choice for your