ACT Lightweight Flywheels for the 2004 - 2010 STi  E-mail this product to a friend previous | up | next  Most stock flywheels are heavy cast iron and are designed for optimum drivability by storing some of the engine’s power in the form of inertia. Light flywheels provide significantly improved engine response and acceleration by compromising drivability. ACT flywheels are designed for improving engine response, strength, and affordability. ACT offers lightweight flywheels for the STi in two trim levels, Streetlite and Prolite. Streetlite / 15.0 lbs. - Preferred for Street and Drag Racing - Improved throttle response and acceleration - Considerably lighter than stock - Most durable flywheel available - Good drivability - ACT Part # 600235 Prolite / 11.1 lbs. - Preferred for Road Racing or minimum inertia - Quick throttle response and acceleration - Lightest with lowest inertia - Reduced drivability - ACT Part # 600240 Streetlite 15lbs SKU: 600235 Dimensions: 15X15X4 Weight: 14.00 Regular Price: $423.30  On Sale For: $341.82  Quantity:    Prolite 11.1lbs Special Order Part -- Please call us at 1-800-830-6675 if your order is time sensitive. SKU: 600240 Dimensions: 15X15X4 Weight: 12.00 Regular Price: $455.13  On Sale For: $409.50  Quantity:

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