The premium reman Alliant Power remanufactured injectors using the latest updated parts and brand new spool valves. These are the closest to new injectors that are available on the market. We do not modify used core injectors. This practice leads to an inferior product and early failure. The 175 cc injector include new 30% over performance nozzle that deliver fuel quicker into the cylinder for a more precise combustion creating more power. These injector need custom tuning, head studs, and a turbo upgrade. Up to 550hp and still ok for towing small to moderate weights.