Performance Valve Springs and Retainer Kit Powerstroke 6.7 Model Year Information: 2004 Models:

Model Year Information: 2004 Models: If you have a 2004 model you must check your VIN code to determine your production date

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

Included with the stud kit are washers and 12-point nuts

This is their famous street setup / daily driver turbo that can still hook up to a trailer when it needs to

boost throttle response

Performance Valve Springs and Retainer Kit Powerstroke 6.7 Model Year Information: 2004 Models:The 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