2015 wrx direct injector upgrade
The newer DIT car's (direct injection turbo - 2015+ WRX and 2014+ FXT) strategy is a bit more reactive. 5:1, with some even running compression ratios as high as 11. A boost leak tester allows you to pressurize the system without having to start the car or bring it up to load. 21 Carbureted Regulators.