034Motorsport High Flow Performance Downpipe - Audi A4 B5 & Audi B6 1.8T - 034-105-4021
This high-flow downpipe replaces the restrictive factory catalytic converter section on 1.8T B5 and B6 Audi A4 and B5/B5.5 Volkswagen Passat models. It is built from full 3" stainless steel tubing with a high-performance 250-cell stainless steel matrix catalytic converter, TIG welded and assembled in-house by 034Motorsport. Precision flanges resist warping, and the exhaust hanger and both oxygen sensor bungs sit in the factory locations, so it bolts up to stock or stock-fit turbos and exhausts. 034Motorsport reports gains of over 26 WTQ and 15 WHP on its dyno with stock turbo tunes, along with quicker spool.
Features
- Full 3" stainless steel tubing, TIG welded
- High-performance 250-cell stainless steel matrix catalytic converter
- Precision flanges resist warping and expansion
- Factory oxygen sensor and exhaust hanger positions
- Bolts to stock or stock-fit turbo and cat-back
- Suits manual, Tiptronic and CVT; FWD and quattro or 4Motion
- Installation hardware included
Specifications
- Brand: 034Motorsport
- Product Type: Downpipe with High-Flow Catalytic Converter
- Material: Stainless steel tubing
- Tube Diameter: 3"
- Catalytic Converter: 250-cell stainless steel matrix
- Construction: TIG welded, assembled in-house
- Oxygen Sensor Bungs: 2, factory locations
- Includes: Installation hardware
- Part Number: 034-105-4021
Vehicle Compatibility: 3 applications across 2 makes. Select a make to view.
Audi (2)
| Model | Variant | Engine | Years | Notes |
|---|---|---|---|---|
| A4 | B5 | 1.8T | 1997-2001 | FWD and quattro; manual, Tiptronic or CVT |
| A4 | B6 | 1.8T | 2002-2005 | FWD and quattro; manual, Tiptronic or CVT |
Volkswagen (1)
| Model | Variant | Engine | Years | Notes |
|---|---|---|---|---|
| Passat | B5/B5.5 | 1.8T | 1997-2005 | FWD and 4Motion |
Please confirm fitment against your vehicle before ordering. Contact us if you need help selecting the right part.