I met a guy with a 4.6l SPF, as I recall it was a tough install in the details (wiring/headers/spacing)...I didn't ask why he did it...'cause the 4.6l is really a pathetic motor when compared to even an LSX Chebby. The 5.4's seems a little better, but the only version I'd do is a 03-04 Cobra motor...and good luck getting the hood to close on the supercharger
