Coming from the Dinan website its definitely not counterfeit. And it will be the same tune they produced and released years ago, it would actually cost them more money to develop a new tune, even if it was half-assed. The reason it's cheap is because they realize that their target market drives F series vehicles now and the m62tu tunes are collecting dust on the shelf. So they are pricing the m62 tunes so that the high schoolers who are inheriting dad's well taken care of X5 or 540 can afford them. Speaking of which I should look at getting it for my e39 540

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Again Daily Driven SC'd 4.6iS, whats the point of having a sweet ride if you dont use it all the time.