JBD is a very solid cost effective tune! I've been running it for 8 months now in my X5d. However the power delivery with piggy boxes are like the on/off switch. Only when you press it's there, otherwise drives like stock - lazy. Imo the best solution is ecm flash like Renntech or Evolve that will give you power always and everywhere. I'm planning to try Renntech this summer.
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Retired: 2005 N52 E90 330i Sport 6AT
Retired: 2007 N54 E92 335i Sport 6AT
Current: 2012 M57 E70 X5 xDrive35D
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