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From a %-gain standpoint, you are not out of the ordinary.
Your M3 made 30% more power compared to the full-bolt-on M3 that also has reference numbers on that same 'Mainline Dyno'. (393hp vs 303hp)
My M3 made 39% more power compared to my 100% stock M3, and I still have all factory cats and just a Megan rear section. (462hp vs 333hp)
If you make the assumption that full-bolt-on + tune is worth 9% over stock, then your power increase is in-line from others. If you take that 9% and subtract it from the 303, a stock M3 on that Mainline Dyno probably nets 277hp.
I do not think you have any operating or power problems, you are just using a brand of dyno that reads significantly lower than the standard Dynojet. If you want numbers for numbers sake, go find a Dynojet.
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2009 E90 M3 DCT
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