RCM700 2.0L Closed Deck Block High Compression Short Engine Exhaust Fitting Kits it is also necessary to

it is also necessary to fit an RCM 3" centre section and 3" down pipe assembly

This fitting kit would be used when fitting the RCM manifold kit RCM3029 to a 2015+ WRX (US only)

What is a Closed Deck Block and why do I need it

Travel: 4"/100mm

Even when fully open these restrict the flow of air traveling into the cylinder head ports

RCM700 2.0L Closed Deck Block High Compression Short Engine Exhaust Fitting Kits it is also necessary toRCM700 2. 0L Closed Deck Block High Compression Short Engine RCM pride themselves on supplying the ultimate range of custom built EJ Series short engines. We have built an enviable reputation of assembling high powered Subaru power units to a meticulous level of detail not seen in the tuning industry before. This level and depth of expertise is based on 30+ years of experience of working with the Subaru brand along with our Gobstopper race car