I know my 06 was really close to pulling through the clutch. My mechanic boosted the HP by a few (reprogrammed the ECM), and it would pull through the clutch just by stepping on the accelerator in fourth and fifth gear.
I think the whole assembly is a little delicate, but mine lasted 110K miles before she got wrecked, including about 30,000 with a 10,000 lbs trailer behind it.
