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      04-14-2014, 02:42 PM   #22
Alan l.
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Drives: 2020 F95 X5M Competition
Join Date: Jun 2009
Location: United States

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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
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