At the mo i have 2 ECU,S and both of them are L1 and one of them dose not work right any way

So wot is a RS500 ECU ( L1 L6 L8 ) i just dont no

And i will be having to by a chip for wot ever ecu i run so thats not on my mind at the mo ..
the car is still being bilt at the mo and when its done i will be takeing it up to MSD to have it all set up