Set of 6 springs that can be used on either the exhaust or intake valves in 12-valve 5.9L Cummins engines; Replacement exhaust valve springs to allow for 60psi of back pressure with Exhaust Brakes; Heavy-duty intake valve springs for high RPM P7100 kits or performance camshaft applications; If installing an Exhaust Brake and P7100 Kit at same time, 2 sets of springs required
