ACT 600145 Streetlite Xact Flywheel Considerably lighter than a stock flywheel CAD designed, CNC machined, and computer balanced for quality and precision Trouble free, one-piece construction allows cost effective resurfacing and eliminates problems associated with multi-piece designs Material is properly distributed on the flywheel for strength, greater heat dissipation, and reduced inertia; integral ring gear is induction hardened for maximum gear life 90 day limited manufacturer's warranty; counterweight sold separately