Quote:
Originally Posted by CanadianM2
MHD provides a 91acn ots file?
Naturally a 91acn file will be more conservative than any regular 91 tune and likely run smoother as a result of no timing pull. That was my case with my local fuel
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https://f87.bimmerpost.com/forums/sh....php?t=1756267
MHD is more conservative up top, runs a more conservative timing curve and fuel pressure. They are very similar overall, but I don't think people with poor fuel quality can go wrong with MHD