Yes the hard top adds weight but all the other stuff is a bout handling and performance and some of the parts provide some weight loss. At the end of the day you can call your car what you like, really, lol. To be honest I just wanted to make it special, yes the ‘CSL’ naming will always call questions, but to me it’s a C ‘Convertible’ SL, lol. Hope you understand.
Also like the look of your car… your car wasn’t the white Z4MC in to Total BMW Mag and number of years ago?
One thing I've learnt about dyno's there all subjective. Pre-Stage 3 Cylinder head, Stage 3 Cams I've had a number of independent dyno's ranging from 378 – 391. However I know the car performance has increased due to the Stage 3 head and cams as my current chassis set-up seems to pitch and drive more than before. Also I’m waiting for the final live mapping that will take into account the Stage 3 head, bigger values, stage 3 cams, etc. I think I posted one of the dyno run’s on the My Z4M CSL Stage 3 Mods posting.
Also the reason why I haven’t be able to get the live mapping work done is because the guy CA-AUTO use for the extreme tuning is never in the country due to his professional motorsport commitments.