ACT 07-09 Nissan 350Z / 09-16 Nissan 370Z / 08-13 Infiniti G37 XACT Flywheel StreetliteBrand ACT Part Number 600590 Category Drivetrain Flywheels Condition Brand New Original Manufacturer Packaging Noticeably improved engine response and acceleration, OE to mild gear rattle; Heat treated forging for strength and toughness, induction hardened ring gears for maximum life; One piece construction allows less opportunity for failure and provides uniform efficient heat transfer from the clutch disc. No more warped inserts or loose ring gears;