I have a buddy that just bought a new 2015 GT premium M6 and looking to do a CAI, resonator delete, cat back to start off. How is the tuning with these cars is it pretty straight forward or a pain? I have been tuning my Turbo 03 Cobra with SCT pro racer and have tuned a couple GM'S using HP Tuners with great success. I like the HP software so much better because of how easy it is to use. I just want to get others opinion before I get started on this car. Any info that would make the learning curve a little easier for me would be greatly appreciated.