E46 Single Mass Flywheel Conversion KitProduct Details Dual mass flywheels allow for fluid feeling clutch engagements and offer a more luxurious feel than single mass flywheels. However, with these benefits come significant drawbacks. Why convert from a dual mass flywheel to a single mass flywheel? Cost: Dual mass flywheels are expensive, with the cost of replacement often times is double or triple than that of converting to a single mass flywheel. Serviceability: Single mass flywheels can