This also is the 1st I have heard of "step down".
Please Define;
Step down:
I was told that I can still use my p10 ecu, I just have to use my DE injectors until I get a tunable ECU I.E; JWT, Calum or NisTune. And I will be able to hit VVL with a MSD window switch but just not over 175HP
Is that correct?