MCATX 4.55" EPA Spun Converter

Free Shipping Info
Free shipping is available to the lower 48 States. Please note that we cannot deliver to P.O. Boxes. Orders will take 1-2 business days to fulfill.

Expedited Shipping Info
Expedited shipping is available for customers who need their products sooner. Please note the following when choosing an expedited shipping method:

• Miller CAT provides the option for expedited shipping, but is only a pass-through for additional charges. We do not make any money off of this service.
• When calculating your possible receive date, keep in mind that shipping services do not ship on weekends or holidays.
• Orders received after 1:00pm PST may not ship until the next business day.

International Purchases
Miller CAT will collect the estimated duties and taxes and pay it on behalf of the customer. The final price you see should be the final price you pay.

Returns
We have a 30-day return policy window for unused products. Please visit this link for more information.

Note: We ask that you carefully review vehicle compatibility and other product/install information before making your purchase. Help us reduce the possibility of returns as much as possible and reduce the carbon footprint of our products, as they are large and expensive to ship.

Warranty Coverage

Emissions Performance Warranty - 25,000 Miles

Our catalytic converters are warranted to meet Federal EPA emissions performance requirements for 25,000 miles from the date of installation, when installed on a properly maintained, EPA-certified vehicle.

Construction & Materials Warranty - 5 Years/50,000 Miles

We warranty the converter’s stainless steel shell, internal substrate, and welds against defects in materials and workmanship for 5 years or 50,000 miles, whichever comes first.

What This Warranty Does NOT Cover

This warranty does not apply to 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 are not covered.

Our MCATX manifold insert converters are engineered to deliver OEM-grade emissions performance in a compact, installer-friendly package. Built in the USA with OEM-sourced substrates and advanced washcoat technology, these converters are designed to meet EPA performance standards on applicable federal-emissions vehicles.

Premium vermiculite insulation improves heat management and substrate retention, reducing rattles and eliminating the need for bulky external heat shields. The compact body and high-quality construction make installation easier in tight or hard-to-reach applications.

We do our best to keep compatibility information up to date. For the most accurate fitment, always confirm your vehicle’s emissions certification (Federal vs. CARB), and match by year, make, model, engine, and emissions family before ordering. These units are EPA-compliant but are not CARB-approved.