Fits 2001-2010 Chevy Silverado/GMC Sierra 2500HD/3500HD LB7/LLY/LBZ/LMM Duramax Diesel This Brand New LBZ based S&S 14mm Stroker Pump(71% over stock displacement) is the best option for any customer looking to get the maximum power and flow out of a single CP3 set up. The 14mm Stroker Pump will out perform and outlast any other pump on the market. They are set up to support well over 1000hp with 1 single CP3. The 14mm pump is modified to eliminate the fuel flow restrictions that begin at 3000 RPM on stock CP3's. This pump can also be used in a LML CP3 conversion(tuning may be required). Notes: ⦁ Brand New Pump (No Core Needed) ⦁ Tuning is REQUIRED if installing on 2001-2005 LB7 and LLY engines ⦁ Fitment on LB7's requires you to modify the regulator connectors to make them fit. ⦁ THE MANUFACTURE, SALE, OFFER FOR SALE, OR INSTALLATION OF THIS PRODUCT IS NOT LEGAL IN CALIFORNIA.