They don't support 06-09 4.2 S/C. This is a great platform and it sucks they don't support these model years. It's basically a destroked Cobra engine. Really wanted to see what I could get out of this thing on e-85. SMH I bought this thing last year and never got a chance to use it because it wouldn't read my model year vehicle,(2008). Anyone got any information on a tune or unlock for the ECU of 06-09 model year RRS S/C?