Exhaust System with Catalytic Converter for Toyota Tacoma (2001-2004) 3.4L

Direct-Fit Stainless Exhaust System with Catalytic Converters for 2001-2004 Toyota Tacoma (VZN170/VZN195)

What it Does: This complete stainless steel exhaust system with dual catalytic converters replaces the entire corroded factory assembly from the front converter pipe to the tail pipe on 2001-2004 Toyota Tacoma VZN170/VZN195 trucks equipped with the 5VZ-FE 3.4L V6.

The Stock Toyota Tacoma Exhaust Corrosion & Catalyst Failure

On VZN170/VZN195 trucks with the 5VZ-FE 3.4L V6, thermal cycling and road moisture corrode the front converter pipe, mid converter, muffler, and tail pipe simultaneously. Rust-weakened flanges develop pre-sensor exhaust leaks that skew air-fuel trim data. Simultaneously, heat soak and vibration fracture the factory ceramic substrate inside the converters. This drops oxygen storage efficiency below ECU thresholds, triggering P0420 catalyst codes and forcing costly piecemeal repairs.

Common Symptoms of a Failing OEM Exhaust System

• Check Engine Light / DTCs: Triggered P0420 catalyst efficiency code caused by degraded converter washcoat or pre-sensor exhaust leaks.
• Metallic Rattles & Leaks: Fractured ceramic substrate or rusted muffler baffles rattling under load, accompanied by audible ticking at the manifold flanges.
• Backpressure & Compliance Failure: Restricted exhaust flow from collapsed substrate, excessive exhaust noise, and failed OBD-II emissions inspections.

The Direct-Fit Stainless Exhaust System Solution

Built from corrosion-resistant stainless steel, this kit replaces OEM numbers 53432, 51-304, 53398, and 47742 in a single bolt-on installation. Mandrel-bent tubing preserves factory exhaust flow geometry without restrictive crimps, while OE-style flanges and hanger rods align with stock mounting points. Both direct-fit converters feature high-flow ceramic honeycomb substrates and stock-position O2 sensor bungs. The system restores quiet, factory-like tone with zero cutting or welding required.

What's Included

• 1 Front Catalytic Converter Pipe
• 1 Connecting Pipe
• 1 Mid Catalytic Converter Pipe
• 1 Long Intermediate Pipe
• 1 Short Connector Pipe
• 1 Muffler
• 1 Tail Pipe
• 5 U-Clamps
• 3 Ring Gaskets
• 2 Manifold Gaskets
• Bolts, nuts, and washers as pictured

Technical Specifications

Compatibility

• 2001-2004 Toyota Tacoma 3.4L V6 4WD Xtra Cab
• 2001-2004 Toyota Tacoma 3.4L V6 4WD Double Cab

Frequently Asked Questions & Fitment Warnings

Does this fit the VZN170/VZN195 Tacoma?

Yes. This is a direct fit for the 2001-2004 Toyota Tacoma equipped with the 5VZ-FE 3.4L V6 engine in 4WD Xtra Cab and Double Cab models. It does not fit 2WD trucks, Regular Cab models, or 2.4L/2.7L four-cylinder engines, and is not legal for sale or use in California, Colorado, New York, or Maine.

Will this clear P0420 codes, and do I reuse my O2 sensors?

Yes, provided your existing sensors are healthy. Replacing degraded converters and leaking pipes resolves P0420 efficiency codes on the 5VZ-FE, and factory O2 sensors transfer directly into the stock-position bungs.

Is welding required, and are gaskets and hardware included?

No cutting or welding is needed. All manifold gaskets, ring gaskets, U-clamps, bolts, nuts, and washers are included for a complete bolt-on installation to factory hangers and flanges.

The Toyota Heavy-Duty Standard

Engineered for trail durability and sustained towing loads, this stainless steel system resists extreme exhaust gas temperatures and harsh underbody corrosion. It restores leak-free scavenging, factory acoustic control, and reliable OBD-II readiness for your first-generation Tacoma.