Specifically for turbo cars with manual transmissions. I've noticed while trying to do wheel stands with cars that are not supposed to ie. 200BX, ETK I-series, and similar RWD turbo cars, there is no way to build boost with the clutch in without doing a pedal dance. (I use a logitech g27). The only way I've found to build boost is to put it in gear, hold the parking brake and manipulate the gas and clutch to load the engine. If there was some sort of adjustable ECU that would allow for setting a secondary rev limiter rpm that is only active in first gear with the clutch in. I don't know how you would fake the engine load to get the turbos to spool, I know a real life anti-lag/two-step lets combustion happen in the exhaust manifold by changing ignition timing, which builds the boost, or with auto cars they use the trans brake, which i was very happy to see made it into the game. Also it would present an opportunity to add that supper aggressive machine gun esque noise while shooting fire out the exhaust. Anyway just an idea, I'd like to see what others think.
I've wanted something like this for a while. And since they added the backfire, they could possibly add some sort of antilag...?