LSA/ZL1 Supercharger Heavy Duty Race Drive (8/10 Rib)The LSA ZL1 Supercharger Heavy Duty Race Drive design is specifically for the LSA ZL1 supercharged engines used in extreme applications. The unique Race Drive pulley positions are optimized to provide extreme belt wrap to avoid slippage under heavy loads during racing and extreme usage. Available in 8 rib, 10 rib combinations The LSA Race Drive will make 5% to 10% more boost that the factory spring loaded tensioner when properly tensioned to the