PM Autoworks Videos Building & Tuning a Subaru STiPM Autoworks Rebuilding a BRZ / FRS Engine. FA20.PM Autoworks shows you how to install coilovers!Quick Guide on how to Walnut Blast your Subaru WRXPM Autoworks Assembling a 500HP Engine. (Time Lapse)Replacing valve stem seals on an FA20 Engine. This was for a new shortblock install that we did on a Scion FR-S.Watch the change in compression and rebound as I adjust the valving on the Ohlins Dampers