This package includes the Exergy Long Life LML Injectors, our LML Improved Stock CP4.2 (equipped with larger diameter rollers, pinned followers, and the Exergy Fuel System saver), as well as replacement left and right-hand fuel rails, all for an affordable retail price of $3,950. This is an excellent option for customers needing to replace their fuel system after a CP4.2 failure. It includes improved versions of all the major components needed, at a retail price cheaper than GM's kit.