All manufacturers (at least in theory) should tune their engines conservatively so that there is ample margin for extra power left untapped. My assumption is that to have that margin of safety for the B48 they had to upgrade internals as a stage 1 tune on the B48 would bring 360 hp, close to or just over 400 tq. I can't imagine a stage 1 tune would impact this engine negatively if cared for properly. I'm personally waiting until the warranty has expired so i guess i'll have some time to let you guys be the guinea pigs.
