Have AWE,or any of these tuners for that matter, published independent dyno figures to prove their claims? If you can get +39hp for a $5K outlay then why bother with X51? On the other hand why didn't Porsche achieve this in the way that AWE claims to have done? Why go to the expense and complexity of the X51 kit for a measly 26hp if an independent tuner can do so much better than Porsche's engineers?