I seen a youtube video of a 550i stock running a e92 335i with jb4 on map 2 on stock turbos pretty much even from a go and after 100mph the 550i starts to pull.
You may lose to the SC M3 though by how much? I don't know... both v8 and the e92 m3 is 3704lbs opposed to the 4300lb 550i...
If you have an XI you would have the advantage off the line for sure.
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