Contact Us

Superior customer service is a top priority at FASS. We expect every FASS System to exceed your expectation. Customer satisfaction, your satisfaction, is the all-important ingredient for success to our business.
Normally, technical issues can be resolved by your dealer’s service department, as they can usually inspect the situation physically. If you’re not satisfied with the dealership’s response you can either email or call FASS.

Contact Us



Diesel Performance Products, Inc.
16240 Hwy O Suite B
Marthasville, MO 63357

Call 1-866-POWER HP / 1-866-769-3747 or 636-433-5410 

Open: M-F 7:00AM-7:00PM

To better assist you please gather the following information available:

  • Your Name, address and daytime phone number
  • Model and Serial Number(Not Motor Number) Example: Model: HD Series, Serial: 00125966
  • VIN Number of Vehicle
  • Date of purchase
  • Nature of Problem