034Motorsport Audi B9 A4/A5 2.0 TFSI Stainless Steel Downpipe with Racing Catalyst - 034-105-4043.
SKU: 14863340364

034Motorsport Audi B9 A4/A5 2.0 TFSI Stainless Steel Downpipe with Racing Catalyst - 034-105-4043.

Sale price$695.25 Regular price$772.50
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Description

034Motorsport Audi B9 A4/A5 2.0 TFSI Stainless Steel Downpipe with Racing Catalyst - 034-105-4043.034 Motorsport Audi B9 A4 A5 2. 0 TFSI Stainless Steel Downpipe with Racing Catalyst 034 105 4043. 034 Motorsport is proud to introduce the all new Cast Stainless Steel Downpipe with Racing Catalyst for B9 Audi A4 A5 & Allroad models equipped with the longitudinal 2. 0 TFSI engine! Designed as a drop in replacement for the restrictive factory catalytic converter, the Cast Stainless Steel Racing Catalyst offers increased horsepower and torque

034 Motorsport - Audi B9 A4/A5 2.0 TFSI Stainless Steel Downpipe with Racing Catalyst - 034-105-4043.

034 Motorsport is proud to introduce the all-new Cast Stainless Steel Downpipe with Racing Catalyst for B9 Audi A4/A5 & Allroad models equipped with the longitudinal 2.0 TFSI engine! Designed as a drop-in replacement for the restrictive factory catalytic converter, the Cast Stainless Steel Racing Catalyst offers increased horsepower and torque throughout the powerband, reduced turbocharger lag, improved throttle response, and an enhanced exhaust note. This upgrade eliminates the primary flow limitation in the factory exhaust system, allowing you to maximize the potential of your turbocharged engine.

Optimized for increased flow and maximum performance, the Cast Stainless Steel Racing Catalyst features organic geometry and a massive 135mm diameter Euro 3 racing catalytic converter in the factory location. This complete drop-in solution includes an integrated 4-bolt flange at the turbine outlet, integrated oxygen sensor bung after the catalyst, integrated 3-bolt downpipe flange, and a complete gasket/hardware kit to allow for precise fitment and ease of installation. The Cast Stainless Steel Racing Catalyst for B9 Audi A4/A5 & Allroad is constructed from 304 stainless steel and TIG-welded for maximum durability and corrosion resistance.

034Motorsport's Cast Stainless Steel Racing Catalyst was developed entirely in-house on 034Motorsport's Development B9 Audi A4 utilizing the latest in 3D Scanning Technology, CAD Software, and Rapid Prototyping Techniques. Final production units were then tested extensively on multiple enthusiast-owned B9 Audi A4/A5, and Allroad vehicles before release.

CAST RACING CATALYST FEATURES

  • Increased Horsepower & Torque Throughout the Powerband (+ 22 HP / + 22 TQ Peak)
  • Quicker Turbocharger Spool & Faster Transient Response (100-200 RPM Quicker Spool)
  • Enhanced Exhaust Note & Turbocharger Sounds
  • Direct, Bolt-In Upgrade for Factory Catalytic Converter
  • Engineered In-House by 034Motorsport's Engineering Team
  • Factory-Location 135mm Euro 3 Racing Catalytic Converter (200 CPI)
  • 304 Stainless Steel Construction with Integrated Inlet/Outlet Flanges & O2 Sensor Bung
  • Precision CNC-Machined Flange Mating Surfaces
  • TIG Welded & Backpurged with Sand-Blasted Titanium-Look Finish


WHAT'S INCLUDED

  • 034Motorsport Cast Stainless Steel Performance Downpipe
  • Integrated Euro 3 Racing Catalytic Converter
  • Factory Turbocharger Outlet Gasket
  • Factory Catalyst to Downpipe Gasket
  • M10 Locknuts (4)
  • M8 Locknuts (3)
  • M8x30 Studs (3)
  • Installation Guide

034 MOTORSPORT B9 AUDI 2.0 TFSI RACE CATALYST PERFORMANCE 

  FACTORY CATALYST 034 RACE CATALYST 
Peak Horsepower 280 HP 300 HP
Peak Torque 309 FT-LBS 322 FT-LBS
Peak HP Gains vs. Factory Catalyst   22 HP @ 5,650 RPM
Peak TQ Gains vs. Factory Catalyst   22 FT-LBS @ 2,850 RPM


FACTORY CATALYST VS. 034 RACE CATALYST - 95 OCTANE


034 RACE CATALYST POWER GAINS - 95 OCTANE

 


SUPPORTED VEHICLES

  • 2017 - Present Audi A4 (B9)
    • 2.0 TFSI
  • 2017 - Present Audi Allroad (B9)
    • 2.0 TFSI
  • 2018 - Present Audi A5 (B9)
    • 2.0 TFSI
  • Important: This racing catalyst requires a Stage 2 ECU remap to eliminate any check engine lights due to removal of the factory catalyst.
  • NOTE: Will not fit vehicles with gas particulate filters (GPFs)

    Shipping Notes
    • Free Standard Shipping on $100+ Orders to the USA.
    • Except Preorder products are shipped in 48 hours.
    • Delivery to the USA:
    1. Standard Shipping : 3-10 business days
    • If time is of the essence, please consider selecting expedited delivery for faster service.
    Exchange/Return Notes
    • We offer a 30-day return/exchange service after receiving.
    • Final sale items are not eligible for returns or exchanges.
    • To process your return/exchange, please contact us at [email protected]
    • Please click here for more details>>> Return & Exchange Policy
    SKU: 14863340364

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    NDA
    New York, US
    ★★★★★ 4
    Overall ok
    Size: Small, Color: Light Gray, Size: Small, Color: Light Gray
    I purchased this for my son for homecoming. 6’, 170, size S. The pants fit well, the jacket is kind of boxy. If you’re looking for a more slim fit on jacket, this is not it. It was too late for us to get anything else. Overall, it was fine. The sleeves At wrist not as crisp. I had to really press to give crisp shape. I steamed the heck out of it. My son was OK with it. Holds up well for one time use. Color was what we wanted.
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    Reviewed in the United States on November 11, 2025
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    ANDER
    Houston, US
    ★★★★★ 5
    Good
    Size: Medium, Color: Champagne
    Nice
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    Reviewed in the United States on May 17, 2026
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    A
    Houston, US
    ★★★★★ 5
    Best bang for your buck
    Size: Large, Color: Navy Blue
    Highly recommend this suit if you’re looking for the best bang for your buck! We did go with another option, but upon receiving the suit, I will definitely keep this seller in mind for other occasions! Do wish you could mis-match the pants and blazer sizes, but still a great option if you can fit the top and bottom together! Even adjusting bigger sizes with a tailor, still cheaper than most options while not appearing as cheap as it is! Also ordered the champagne color, very admirable as well!
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    Reviewed in the United States on May 27, 2025
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    sheldon phillips
    Bozeman, US
    ★★★★★ 2
    Pants size
    Size: X-Large, Color: Champagne
    The pants are too small for an XL size.
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    Reviewed in the United States on September 23, 2025
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    JMommy
    Port Orchard, US
    ★★★★★ 5
    Great vest
    Size: 12, Color: Black
    Great vest. I love the slim fit. It looks very nice on my son, not baggy or boxy looking like some vest. My son has used it for several occasions including a wake, a Beta Club induction, awards day, and soon his graduation celebration at church. The quality and material are good. Definitely worth what I paid.
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    Reviewed in the United States on May 29, 2026

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