This stainless steel downpipe with an integrated racing catalytic converter is a bolt-in replacement for the restrictive factory catalyst on the B9 Audi S4 and S5 with the 3.0 TFSI engine. 034Motorsport quotes peak gains of 21 BHP and 44 Nm, turbo spool 150-300 RPM sooner, sharper transient response and a stronger exhaust and turbo note. A 148mm Euro 4 racing catalyst sits in the factory location, and the downpipe is TIG-welded and back-purged 304 stainless steel with an integrated V-band turbo outlet flange, 3-bolt downpipe flanges, an oxygen sensor bung and CNC-machined mating faces. An OE-style heat isolation barrier limits heat transfer into the engine bay, and the brand developed and track-tested the part on its own B9 S4.
Features
- Quoted gains of 21 BHP and 44 Nm at peak
- 150-300 RPM quicker turbo spool, per 034Motorsport
- 148mm Euro 4 racing catalyst in the factory location
- TIG-welded, back-purged 304 stainless steel
- Integrated V-band and 3-bolt flanges plus O2 sensor bung
- OE-style heat isolation barrier
- Gasket and hardware kit included
Specifications
- Brand: 034Motorsport
- Product Type: Downpipe with Racing Catalyst
- Material: 304 stainless steel, TIG-welded and back-purged
- Catalyst: 148mm diameter Euro 4 racing catalytic converter
- Flanges: Integrated V-band turbo outlet and 3-bolt downpipe flanges, CNC-machined mating surfaces
- Includes: Downpipe with integrated catalyst, factory turbo outlet gasket, 2 factory catalyst to downpipe gaskets, 6 M8 locknuts, 4 M8x30 socket head cap screws, 4 M8 washers
- Installation: Moderately involved, approx. 3 hours
- Part Number: 034-105-4045
Vehicle Compatibility: 2 applications across 1 make. Select a make to view.
Audi (2)
| Model | Variant | Engine | Years |
|---|---|---|---|
| S4 | B9/B9.5 | 3.0 TFSI | 2017-on |
| S5 | B9/B9.5 | 3.0 TFSI | 2017-on |
Please confirm fitment against your vehicle before ordering. Contact us if you need help selecting the right part.