No experience with xhp for the dct. Heard issues with the software so I left it alone, the dual clutch shifts plenty fast for me. Friend has xhp on his 335 and likes it but his is an 6 speed auto transmission.
Would suggest some preventative maintenance before pushing the car hard like walnut blasting to clean the valves. I did it at 40k and it was pretty bad. Also plugs and coils, consider one step colder ngk plugs. Good luck.
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