The Skunk2 Alpha Downpipe is a high-flow, precision-engineered exhaust component designed for the 2018–2021 Honda Civic Type R. Built with full 304 stainless steel, this true 3″ (76 mm) downpipe delivers superior exhaust flow, durable construction, and a performance-focused fitment that complements both OEM and aftermarket exhaust systems.

Mandrel-bent tubing ensures smooth gas flow through every section, while robotically TIG‑welded joints, robust flanges, and an integrated stainless flex section provide a leak-free and vibration-tolerant assembly. This version includes a Max Flow 100‑cell catalytic converter to balance emissions compliance with minimal flow restriction. O2 sensor bungs are located in OEM positions, and the downpipe is compatible with factory heat shields and mounting points.

Key Features:

• True 3.0″ (76 mm) tubing from end to end in 304 stainless steel

• Mandrel-bent for optimal exhaust flow

• Robotically TIG-welded seams

• Heavy-duty flanges for durability

• Stainless steel flex pipe section to absorb vibration

• Includes Max Flow 100-cell catalytic converter (catted version)

• O2 sensor ports in OEM locations

• Compatible with OEM heat shields

• Includes all required hardware for installation

• OEM-level fitment for straightforward mounting

Vehicle Fitment:

• Honda Civic Type R (2018–2021)

What’s Included:

• (1) Skunk2 Alpha Downpipe w/ 100-cell cat

• Installation hardware (gaskets, bolts, flanges)

• Instructions as needed

Recommendations & Notes:

• Best paired with the Skunk2 MegaPower Double Barrel DB Exhaust (P/N 413-05-6075) for optimized flow and sound.

• This downpipe is labeled as “special order / not CARB legal” in some listings, so confirm local emissions compliance before use.

• Because it’s a cat version, it offers a balance between flow and emissions, but removing or replacing the cat may be considered for full race setups.