Hello,little response on this item...just wondering what's best,chip-tuning,new software,black(tuning box) and what about the gearbox???can it handle it...drive train...They told me it's basicly an x5 and has no problems what so ever,others tell me to be carreful on the gearbox-drivetrain.I want to do this becouse i'm trailing some heavy loads(pinzgauers,volvo c303 on a trailer) and have the feeling the range can use some more torc and power?