New OEM RA Shortblock W- Forged CP Hybrid Pistons 99.5 Wire In ECU's Symmetrical 4-1 design maintains consistent

Symmetrical 4-1 design maintains consistent and high velocity exhaust gas flow as RPMs rise

Dual coil output channels

Direct Spark

O2 Bung and Plug

Fuel enrichment control

New OEM RA Shortblock W- Forged CP Hybrid Pistons 99.5 Wire In ECU's Symmetrical 4-1 design maintains consistentOutfront 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 S20 cylinder heads found on the 02 05 WRX and other EJ20 applications without cylinder head combustion chamber modification. This configuration includes: Custom Outfront Motorsports spec Hybrid CP piston set (25. 5cc) for EJ20 Heads New OEM STI black Nitrite 2017+