Really my only concern about the G87 is if they can keep the weight reasonable, and if carbon buckets will be available.
Everything else should be one step up from the current M2C, which is a legendary car as far as I'm concerned. Steering will evolve, interior will be on par with 3 series/X3 which is a big jump, S58 with 6MT will be a known quantity from the M3/4.
If this ends up being the last 3 pedal M car, I have almost no choice but to make room for one
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Current:
16 F82 M4 GTS, Black Sapphire/Black, DCT
08 E92 M3, Sparkling Graphite/Bamboo Beige, 6MT
07 E85 Z4M Roadster, Alpine White/Red, 6MT
99 E36 M3, Techno Violet/Dove Grey, 6MT