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Just buy one direct from Racechip should come in 2 days - luckily on the M5 both ports in the engine bay are easy to get to so maybe 10 mins max to install.
If I drive mine without it turned on its a different animal.
It does depend on your driving style - I live in the sticks and on the back roads it's a massive improvement.
If you don't tend to drive it hard it may not be worth it.
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