ACT 09-16 BMW 135i/335/435/535/Z4 XACT Flywheel ProMass Brand_KTuned 4 Cables Lug Rivets

4 Cables Lug Rivets

The internal bubble is normal

European and JDM Models

heat-treating process for unparalleled performance

These tricks can help increase airflow by up to 30% (depending on turbocharger and application) and reduce compressor surging

ACT 09-16 BMW 135i/335/435/535/Z4 XACT Flywheel ProMass Brand_KTuned 4 Cables Lug RivetsNoticeably 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; Recommended for street and race use; Forged, CNC machined and dynamically computer balanced for smooth high