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I had the Dinan tune put on my 08M3 in early 2017 when it was on sale for $279. It is a mild tune. Raised the limiter to 8600. Does not get rid of cold start or CEL when using an x pipe. You might feel the engine is a little smoother but it does not add enough power to feel. Combine it with a few mods and you should feel a cumulative effect — x pipe, intake, pulley. But again beware it does not help with check engine light from test pipes or x pipe.
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