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Dinan always advertises their crank HP/torque numbers and they are usually not inline with real life gains (you can find several threads under M3/M4 subforums). I think Dinan is just total waste of money and I rather get a flash tune for the fraction of how much Dinan costs. BM3 or BPM flash tune is the way to go IMO. I'm personally planning to get a genuine M4 CS tune from BPM after my break-in service.
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