Performance Valve Springs and Retainer Kit Powerstroke 6.7 Each kit comes ready to

Each kit comes ready to install with the brackets

Avoid a costly failure down the road and convert your CP4 to a CP3 with our complete

5 inch aluminum from turbo to filter

The XDP High Output 220 Amp Alternator almost doubles the factory output

boost throttle response

Performance Valve Springs and Retainer Kit Powerstroke 6.7 Each kit comes ready toThe XDP Performance Valve Springs and Retainer Kit XD386 are a perfect upgrade for your modified 2001 2016 GM 6. 6L Duramax. Camshaft upgrades and other modifications that increase boost require more valve control. The XDP Performance Valve Spring feature a conical design for better valve control than a standard straight spring. The conical design also allows for smaller and lighter spring retainers. Each spring undergoes a stress relief process and