Dodge, Freightliner, Mercedes 2500/3500 Sprinter 3.0L Flex/Coupling Repair Kit

SHIPPING & RETURNS

Free shipping

Free ground shipping to the lower 48 states. We cannot deliver to P.O. Boxes. Orders usually fulfill in a few business days.

Expedited shipping

Expedited shipping is available at checkout. Miller CAT passes through carrier charges at cost — we do not mark up expedited shipping. Keep in mind:

• Shipping services do not operate on weekends or holidays
• Orders placed after 1:00 PM CST may not ship until the next business day

International orders

Duties and taxes are collected at checkout and paid on your behalf — the price you see is the final price you pay. EU customers have a 14-day right of withdrawal. View our full shipping policy.

Returns

We have a 30-day return window for unused, uninstalled products in original packaging. Returns are subject to a restocking fee of up to 20%. Please verify vehicle compatibility before purchasing — these products are large and expensive to ship, and every return has an environmental cost. View our full return policy.

CARB COMPLIANT CATALYTIC CONVERTER — WARRANTY INFORMATION

5-year / 50,000-mile warranty

Miller CAT CARB Compliant catalytic converters are warranted to be free from defects in materials or workmanship that would cause the converter to fail an emissions test for 5 years or 50,000 miles from the date of installation, whichever occurs first.

Warranty conditions

• Converter must be properly installed on a vehicle it is approved for
• Vehicle must be maintained in proper operating condition
• Proper maintenance records must be available showing that diagnosis and maintenance were performed to remedy the cause of the failed converter

What's not covered

• Converters damaged or failed due to improper installation
• Use on non-approved or modified vehicles
• Engine conditions such as misfires, rich/lean fuel mixture, oil or coolant burning
• Physical impact, road debris, or off-road use
• Contaminated fuel or additives
• Any pre-existing mechanical issues that affect emissions
• Labor, diagnostics, shipping, towing, or incidental costs

How to submit a claim

A warranty claim requires the defective converter to be returned to an authorized dealer along with proof of purchase and a properly completed warranty certificate.

Limitation of liability

Miller CAT Corp is not liable for any consequential damages arising from the use of this product, including but not limited to labor costs, transportation costs, damage to other parts of the vehicle, or damage to persons, other property, or vehicles.

For warranty claims, email support@millercat.com with your order number, proof of purchase, photos, and a description of the issue. View full warranty information.

Our substrates use the same washcoat technology and substrates as the OEM. The converters are made from high-grade stainless steel and formed by advanced CNC spin-forming machines. The matting of the converter improves insulation and thermal stability, eliminating the need for heat shields. Our design minimizes welds on the converter, prevents leaks, and makes it easier to install.

We do our best to update compatibility information as it becomes available. For the most up-to-date information, search for all CARB legal catalytic converters here or the CARB Aftermarket Catalytic Converters Database.