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Description
034Motorsport Audi B9 RS5 2.9TT Stainless Steel Downpipes - 034-105-4046034 Motorsport Audi B9 RS5 2. 9TT Stainless Steel Downpipes 034 105 4046 The 034 Motorsport Stainless Steel Racing Catalyst Set for B9 Audi RS5 is designed as a drop in replacement for the restrictive factory catalytic converters. The Stainless Steel Racing Catalyst Set offers increased horsepower and torque throughout the powerband, reduced turbocharger lag, improved throttle response, and enhanced exhaust note. This upgrade eliminates the primary
034 Motorsport - Audi B9 RS5 2.9TT Stainless Steel Downpipes - 034-105-4046
The 034 Motorsport Stainless Steel Racing Catalyst Set for B9 Audi RS5 is designed as a drop-in replacement for the restrictive factory catalytic converters. The Stainless Steel Racing Catalyst Set offers increased horsepower and torque throughout the powerband, reduced turbocharger lag, improved throttle response, and 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 Stainless Steel Racing Catalyst Set features two massive Euro 3 racing catalytic converters in the factory locations. This complete drop-in solution includes an integrated v-band flange at the turbine outlets, integrated oxygen sensor bung after the catalysts, integrated 3-bolt downpipe flanges, and a complete gasket/hardware kit to allow for precise fitment and ease of installation. The Stainless Steel Racing Catalyst for B9 Audi RS5 vehicles is constructed from 304 stainless steel for maximum durability and corrosion resistance, is TIG-welded and back purged, and includes an integrated OE style heat isolation barrier to minimize exhaust heat transferred into the engine bay.
034Motorsport's Stainless Steel Racing Catalyst was developed entirely in-house by 034Motorsport's Engineering department and tested extensively internally as well as beta customers.
FEATURES:
- Increased Horsepower & Torque Throughout the Powerband
- Quicker Turbocharger Spool & Faster Transient Response (150-300 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 Euro 3 Racing Catalytic Converter
- 304 Stainless Steel Construction with Integrated Inlet/Outlet Flanges & O2 Sensor Bung
- Precision CNC-Machined Flange Mating Surfaces
- OE Style Heat Isolation Barrier
- TIG Welded & Back purged
WHAT'S INCLUDED:
- Stainless Steel Racing Catalyst Pair
- V-Band Gaskets x2
- Socket Head Cap Screws M8 x6
- Flat Washers M8 x3
- Copper Distorted Thread Flanged Nuts x6
Related product: Audi B9 RS5 Tuning
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.9 ★★★★★
Based on 8 reviews
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Product Reviews
★★★★★ 5
Highly Recommend – Amazing Results on My Honda Accords!
Size: 1 Count (Pack of 1), Size: 1 Count (Pack of 1)
I recently used the Cerakote Headlight Restoration Kit on both my 2008 and 2014 Honda Accords, and I’m genuinely impressed. The headlights on both cars were badly oxidized, hazy, and yellowed from years of sun exposure. After following the kit’s instructions, they look crystal clear and almost like new again.
The process is pretty straightforward and beginner-friendly. It does take roughly an hour per headlight set if you follow all the steps carefully and allow proper air drying time before the final clear coat. There’s a bit of elbow grease involved with the sanding and polishing stages, but nothing overly difficult. The kit provides everything you need, and the instructions are clear.
The results are excellent! Both cars now have headlights that look factory-fresh. I’m really happy with how bright and clear they are at night. Best part? I saved a ton of money by restoring them instead of buying expensive OEM replacements.
The only minor uncertainty is long-term durability (how well the clear coat holds up after a couple years of sun, weather, and car washes), but for the price and the dramatic improvement I saw, it’s absolutely worth it. I’d definitely buy this kit again if needed.
Highly recommended for anyone dealing with cloudy headlights. Great product that delivers professional-looking results at a fraction of the cost!
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Reviewed in the United States on May 3, 2026
★★★★★ 4
Best product I've tried so far but still temporary. YMMV.
Size: 1 Count (Pack of 1)
This product really does work. It is the best I've used. I purchased in September 2024 and am writing this review in May of 2026, roughly one year and 8 months later. I noticed product failure a little after a year after application and it has been degrading slowly since. Currently the product is visible like a layer of clear paint flaking off and you can physically scratch some off. Here are the pros and cons.
Pros: Clarity, relative ease of use, value
Cons: Taping and sanding, doesn't last for as long as you own your car as claimed
Best used as a temporary fix. Bottom line, would I use it again? Yes. What am I doing today? Replacing the headlights completely. Why? I plan on keeping my car for longer than a year.
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Reviewed in the United States on May 8, 2026
★★★★★ 5
Review After Using on 3 Different Cars over 3 years
Size: 1 Count (Pack of 1)
Cerakote Headlight Restoration Kit : After Using on 3 Different Cars over 3 years
This is my second time purchasing the Cerakote Headlight Restoration Kit, and I’ve now used it across three different vehicles. At this point, I feel comfortable saying this product genuinely works when used correctly.
Before trying this kit, I considered replacing my headlights entirely. The cheapest replacement set I found was around $150 just for the parts. Installation would have required removing the grille, bumper, and other components, which adds time and complexity. For an older vehicle, that didn’t make financial sense.
Instead, I chose to restore the original headlights.
Cost and Value
My first package cost me $17, and I restored two cars with that single kit ( about 9$ per pair). That alone made it worth it.
For under $20:
I restored two separate vehicles
Avoided buying new headlight assemblies
Avoided removing the bumper and grille
Compared to a $150+ replacement plus labor, the savings are significant.
Durability 1 year+ under direct Cali sunlight (currently on year 2 and still good)
First Car – Learning the Process
The first time I used the kit, my results were decent but not perfect. That was mainly because I didn’t fully understand how sanding and polishing actually work. ( this reoxidized fastest under 8 months, but it was mostly my fault)
I didn’t initially realize:
The headlight needs to stay wet during sanding
Oxidation must be completely removed before applying clear coat
Even pressure matters/ 50% overlap coverage when appling ceramic
Once I understood that sanding is the most important step, everything improved.
Second Car (beater) Major Improvement
The second vehicle was heavily oxidized and yellowed. I used the remaining material from that same $17 kit and restored it completely.
The clarity difference was dramatic. It looked close to factory condition, and night visibility noticeably improved. That was when I realized the product itself is solid; the key is proper technique.
Third Car ; Recent purchase
By the third car, the process felt straightforward. I followed the instructions carefully, kept the surface wet while sanding, and applied the clear coat evenly in one smooth pass.
The final result was clear, glossy, and uniform. No haze, no streaking.
Durability
On my first vehicle, the restoration lasted close to a year perfectly( I sold that car this year and it still had clear headlights), and that car was parked outside in direct sun most days. For a DIY kit at this price point, that level of durability is impressive.
Final Thoughts
I seriously considered spending $150 on replacement headlights( this was cheapest ) and dealing with removing body panels. Instead, I spent $17 and restored two cars.
Now having used it on three vehicles, I can say this kit is effective, cost-efficient, and worth the time if you follow the process properly. It does require effort and patience, but the results justify it.
I would purchase it again.
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Reviewed in the United States on February 18, 2026
★★★★★ 5
works as advertised!
Size: 1 Count (Pack of 1)
I purchased this kit to renew the headlights on my 2016 Nissan Frontier pick-up. The headlights had become slightly oxidized and dull -- not that bad but it was bothering me and for the price of the kit I figured it was worth the effort to attempt to renew them.
All I can say is -- WOW, what a difference. The end result looked like new -- clean, brilliant and bright.
Read the directions (2 or 3 times) and follow them EXACTLY. Total time for me from opening the kit to being done was about 2 hours and I was taking my time.
This kit is different in that the final step applies a UV resistant coating which really makes the glass super transparent.
Great investment in the time and money. I can't stop admiring my new (old) headlights!
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Reviewed in the United States on May 14, 2026
★★★★★ 5
Incredible Results! The "Z-Line" is Back!
Size: 1 Count (Pack of 1), Size: 1 Count (Pack of 1)
I’ve tried a few "wipe-on" fixes in the past, but the CERAKOTE® Ceramic Headlight Restoration Kit is in a completely different league. If you are tired of hazy, yellowed lenses and weak nighttime visibility, look no further.
📖 Instructions & Ease of Use
The first thing that stood out was the clarity of the instructions. The kit breaks everything down into a simple, step-by-step process. Even if you aren't a "car person," the directions are foolproof. They don't just tell you what to do; they explain why each step matters, which gave me the confidence to get the job done right the first time.
✨ Restoration Effectiveness
As you can see in my Before and After photos, the transformation is night and day. My headlights went from a dull, oxidized yellow to a factory-fresh, crystal-clear finish. It didn't just "clean" them—it completely rejuvenated the plastic.
🔦 The Real Test: Light Output & Beam Pattern
The most impressive part isn't just how the car looks, but how it performs at night. I’ve included a photo of my car parked against a wall in the dark to show the comparison:
Passenger Side (Restored): You can see a sharp, distinct cutoff line and the perfect "Z-line" pattern. The light is focused exactly where it needs to be on the road.
Driver Side (Not Restored yet): The light is completely distorted. There is no cutoff, just a messy blob of light that scatters everywhere, likely blinding oncoming traffic while providing less actual visibility for me.
Final Verdict
This kit doesn't just make your car look better; it’s a genuine safety upgrade. Seeing that crisp Z-line back on the wall proves that the clarity is internal as well as external. Highly recommended!
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Reviewed in the United States on April 15, 2026
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