New OEM RA Shortblock W- Forged CP EJ255 Pistons 99.5 w- Race Bearings 99.5 Wire Harness Connectors High spring frequency to allow

High spring frequency to allow for better spring surge control at high rpm

85 ft/lbs on outer four with ARP lube

Custom high flow low inertia 64mm turbine wheel

reduced driveline shock

Height: 42 mm

New OEM RA Shortblock W- Forged CP EJ255 Pistons 99.5 w- Race Bearings 99.5 Wire Harness Connectors High spring frequency to allowOutfront Motorsports Stage 1 RA shortblock is for that added Protection against ring land failure on a lightly modified car. These custom pistons are made specifically for use with the D25 cylinder heads found on the 06 14 WRX and other EJ255 applications. This configuration includes: Custom Outfront Motorsports spec EJ255 CP piston set (24cc) for D25 Heads New OEM STI black Nitrited 2017+ crankshaft New OEM STI connecting rods King Performance Rod