These other Wester's dealers have the products Lyndon makes for other cars, and are most likely good tuners in there own right, they may mistakenly think they can tune a GXP, and most likely would be doing a live tune and not an upload, if they have bought the added software package from Lyndon that would enable them to do it, which as far as I know Lyndon does not sell yet, or they are using HP Tuners to do a tune and not an upload, and it does not have the full capabilities Lyndon does. You have an opportunity most of us would kill for, you can go and actually have Lyndon do your tune and test it on the dyno, especially since your car is pretty much stock, MAKE THE DRIVE TO THE REAL WESTERS GARAGE. You will absolutely get the best tune this way, it is well worth it, just ask any of his customers.