1. Would not the smaller diameter M12 bolt have to carry and hold more load and torque. I doubt it will ever come up to that however what is the stock OEM bolt grade ?? 8.8 ?? 10.9 ?? I guess one could upgrade to 12.9.
2. What is the biggest diameter rotor the stock 350Z Brembo calipers allow you to use in the front ???
Thank you for reading and any info given. God Bless !!!