Genuinely shocked Nissan/Infiniti offer such a sweet factory/dealer option exhaust. Hopefully the goodies available for the sport model Q60 are available for the upcoming 400z. No sexy exhaust manifolds though as the engine will have these integrated into the heads.
Warranty friendly upgrades
https://conceptzperformance.com/nissan-infiniti-infiniti-sport-exhaust-w-helmholtz-mufflers-axle-back-exhaust-system-infiniti-q60-17-cv37-in-stock-b0100-q60s2_p_32823.php