I didn't when i had my 535 but i don't think that made a difference. I know several 535 guys with the tune and all of them dyno'ed around the same hp. I mean it felt better for sure but I was disappointed with the power it made on the dyno compared to what the N54 was capable of. Now i have a 550 so that fixed my hp issue
but thinking I should get the N55 F15 instead next year because I am only averaging 9-14mpg with my 550 so I can't even imagine what it would do in the heavier N63TU F15