I think they have done custom jobs before, but I don't know their record for completed systems.

I would use the srt6 injectors, since I would like to limit the Hp to around 300 hp just for reliably of the stock engine and clutch.

Actually I was scrounging around an ECU shop and they have SLK32 ecu's for about $600, but I'll ask SI and see if it can operate in the crossfire.