Both awesome cars - but if you do the M3 ZCP - get the M Performance Exhaust - it is worth every penny. My 2015 M3 was stock exhaust - now I have the 2018 ZCP with MPE - and OH MY GOD - the SOUND!!!!!
I'm sure GT350 sounds incredible too - but the difference in practicality goes way in favor of the M3. If you then add the MPE to the M3 ZCP, you've now just significantly narrowed the "sound" gap as well (closer to a "win-win" situation)...
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