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I can also vouch for ProTuningFreaks and Bootmod3. I also had a custom Burble tune done by HCP as well. I went from Stock to Stage 1 which was a huge difference. More linear power, smoother shifts.
I then added a Dinan Intake, Dinan Exhaust and ER catless downpipes and went Stage 2 and again saw a decent gain in power. HCP then offered me a custom tune to add a little more power with exhaust burbles and WOW! Drivability and power increased again and the X5M is an absolute beast now. I have a few videos of the exhaust, but don't know how to share them here.
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