MOCW 2.5-inch Front Catalytic Converter, 2-Pack Universal Stainless Steel 400-Cell High-Flow

MOCW's 2.5-inch universal high-flow front catalytic converter is a stainless-steel, EPA-compliant direct-replacement unit (sold as a 2-piece set) designed to reduce emissions and improve exhaust flow for vehicles with 2.5" exhaust piping.

This pair of universal front catalytic converters from MOCW offers a compact 11" overall length and 2.5" inlet/outlet to match many aftermarket and stock systems. Constructed from durable 409 stainless steel and built with a 400-cell honeycomb substrate, the converters focus on reliable flow characteristics while meeting federal EPA standards. They are sold as two pieces and include no oxygen sensor ports or air injection tubes, so install considerations and local regulatory restrictions should be checked before purchase.

What are the physical specs and material details?

Each converter has a 2.5" inside diameter inlet and outlet, and measures approximately 11" overall. The shell and pipes are made from 409 stainless steel for corrosion resistance and long service life. These universal units are reversible and intended to be cut or welded into place as needed.

• Inlet/Outlet diameter: 2.5 inches (standard fit for compatible exhaust)
• Overall length: 11 inches
• Cell density: 400 cells
• Material: 409 stainless steel for corrosion and wear resistance

How does this converter affect exhaust flow and performance?

The MOCW high-flow substrate is engineered to reduce back pressure while still providing emissions control, which can help the engine operate more efficiently. Users typically see improved exhaust flow characteristics when replacing a more restrictive converter. Keep in mind that on-vehicle results depend on the whole exhaust system and engine tuning.

• High-flow 400-cell honeycomb design lowers back pressure
• Stainless steel body resists corrosion that can restrict flow over time
• Reversible design allows flexible orientation during installation
• No built-in O2 sensor port — check your vehicle’s sensor needs

Will this part fit my vehicle and is it street-legal where I live?

These are universal converters meant for vehicles that accept a 2.5" outer diameter exhaust pipe and compatible with systems that do not require an O2 sensor or air tube in the converter itself. They are manufactured to meet federal EPA requirements, but not all states accept federally-compliant aftermarket converters.

• Universal fit for 2.5" exhaust pipe outer diameter systems
• Not legal for sale or use in California, New York, Colorado, and Maine
• Confirm local aftermarket converter rules before buying
• May require cutting, welding, and professional installation

What comes in the package and what warranty is offered?

Each order includes two MOCW catalytic converters, packaged as a matched pair for front or mid-pipe replacement. MOCW supports the product quality with a manufacturer warranty and recommends professional installation to ensure proper fit and exhaust sealing.

• Package contains: 2 × 2.5" universal catalytic converters
• Manufacturer warranty: 5 years or 50,000 miles
• Installation: direct-replacement design; cutting and welding may be required
• Note: no O2 sensor or air injection tube included

Who this is for: drivers and mechanics who need a compact, universal front catalytic converter for systems with a 2.5" exhaust connection, and who require an EPA-federally compliant option outside restricted states. This 2-piece MOCW set is well suited for aftermarket exhaust upgrades, custom exhaust shops, and vehicle owners wanting improved flow and durable stainless-steel construction. If your vehicle is registered in California, New York, Colorado, or Maine, do not purchase this part; check local laws for approved replacement converters.