I ran the Xcharger Xtreme on my 2006. I installed it at 90,000 miles (after two seasons of drag racing it with a 75 shot of nitrous). Sold it in June 2012 when I ordered my 2013 and it had 203,000 miles on it, still running mid 12's. Ran about 12lbs of boost on the Xcharger.
Stock internals, nothing was done to the engine. If you have a good tune, maintenance kept up to date, you will have no problems.
And the buyer from June 2012 just put it up for sale again. Car now has 211,000 on it, still will run in the 12's.