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Do we have any real world numbers on the Racechip piggyback? Looking for M50i ones. I had one on my 650i years ago and my "butt dyno" didn't notice any difference. I sold it and got a flash tune for the same car, and noticed a differnce in power immediatelly.
Would love to see some of the claims backed up by a 3rd party before pulling the trigger. Something like a before and after dyno or Dragy would be nice. I've seen people not gain anything on dynos and they claimed to have some "adapting issues" on the older cars.
All I see are their own videos on Youtube, which can be easily manipulated via throttle using 0-60 and 60-130 pulls.
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