im not sure myself, i just thought i read somewhere that early 06 was ratied at 600trq and late 06 was rated at 610trq. i was unaware of that if its even true?
Either way, it was just a rating and I don't believe there were any changes. The only notable change was from the '04 to the '04.5 model year. No worries.
There is a difference, the late 06 had a different ECM program and it wont run a TST programmer and it seems youll get a little more out of a tune with a early 06
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