Its not a giant change with the M compared to my wavetrac. I am sure you will be happy. My other BMW spins to 14600k and I just changed the final drive ratio - I guess I like high rpms
For me this is all about fun versus cost. Compared to costly carbon pieces you get a lot of improved fun for street driving. Just saying.
Its a manual, those are desired and a non M LSD is probably not a big issue for selling. Tuning the engine is more of a concern for me if I would get a used M235i. Just my thoughts.
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[FONT="Arial"] M235i 6 speed, MGM. Wavetrac LSD with altered final drive ratio, MPE, MPK Airbox, side skirts, diffuser, Dinan springs, LCAs.