Check out Active Autowerke and see what they offer. I had an E36 with a M50 and 5 speed and their supercharger kit, that car was an absolute blast and made all of the right sounds. I couldn’t imagine that car with even another 50hp, THAT would be fun.
My suggestion would honestly be to go to a local BMW event, cars and coffee, etc and see if you can score a test ride in a few cars. See which one puts the biggest grin on your face regardless of HP or cylinders and pursue the combo that makes you the happiest.
I love an I6 and do honestly think it is the best engine setup, BUT, I am also a firm believer in a 6.0 LS. Whichever tickles your fancy.
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