I went with a version 8 engine, no risk of Immobilizer nor oil radiator issues, I considered the spec c but i want to keep the swap as simple as possible. Going to keep the stock downpipe and hope my 3" catback plays along nice. Will probably run on the stock ecu settings. I alway run high grade 93 octane from Sunoco or mobile. I'll teat it nice and not beat on it till I figure out an aftermarket downpipe and tunning.