SteamSpeed 4-Port Boost Control Solenoid (BCS) Universal N54 The FA20 produces a ton

The FA20 produces a ton more backpressure with these larger turbos than say the EJ25

like waterproofing

catless downpipe

getting best out our BB turbo vs other non-BB turbos

We recommend it for WRX owners who have built blocks or higher flowing motors

SteamSpeed 4-Port Boost Control Solenoid (BCS) Universal N54 The FA20 produces a tonThe SteamSpeed 4 port Electronic Boost Controller ups the ante again. Our 3 port controller is vastly superior to the stock units, but our 4 port version goes further providing the maximum level of boost control available allowing more sophisticated boost control schemes allowing the tuner to have even more control and wider ranges of operation of the wastegate. Our 4 port controller can be used in many configurations, so consult your tuner to