The AFC Spring Kit allows you to achieve a good compromise of minimal smoke under acceleration with responsiveness.
Kit Includes- Medium and light AFC springs for the P7100 pump, Allen screws, Allen wrenches, Break-off screws, Instructions are included, of course.

The kit goes into the same AFC housing that is removed to install the fuel/cam plate.
The AFC Spring Kit is recommended for 215 hp engines at any power level, & for higher power 12 Valve Cummins applications.