As Marcthedark said, you need to baseline your own car on the same dyno you plan to use after mods. Otherwise too many variables...
Curious to see what gains you can get from the small engine that's already pumping out so much power?
Wish I could do something for my rather un-highly strung 198bhp version of the 2 litre engine... Waiting for someone like MHD to release a tune.
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2019 X3 M40i, Sophisto grey, H/K, pano
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