The IE ProCore Downpipe for your Audi B9 S4 or S5 delivers an improved exhaust note and increased flow. Our in-house engineered 6" 400CPSI catalytic converter channels substantial flow to support upgraded engine tunes and larger turbochargers. The specialty tri-core design and precious metal coatings align with ECU emissions requirements so that you can upgrade without the check engine light.
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- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Sep 28 - Oct 3
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Description
IE ProCore Downpipe For Audi B9 S4 & S5The IE ProCore Downpipe for your Audi B9 S4 or S5 delivers an improved exhaust note and increased flow. Our in house engineered 6" 400CPSI catalytic converter channels substantial flow to support upgraded engine tunes and larger turbochargers. The specialty tri core design and precious metal coatings align with ECU emissions requirements so that you can upgrade without the check engine light. IE PROCORE CEL FREE NO CHECK ENGINE LIGHT HIGH FLOW 6"
IE PROCORE
CEL-FREE
NO CHECK ENGINE LIGHT
HIGH-FLOW
6" 400CPSI
CATALYTIC CONVERTER
SUPPORTS
STOCK & HYBRID
TURBOCHARGERS
LEADING FEATURES
- IE ProCore catalyst -No check engine light
- High-flow design -Supports hybrid & large turbo power
- Increases sound -Full and enriched exhaust note
- Bolt-on direct fit -No cutting, no welding, no hassle
- High quality -Stainless steel, TIG welded, & investment casting
DESIGN DETAILS
THE PROCORE ADVANTAGE
IE's in-house engineered ProCore Catalyst features our own tri-core design with a specialized coating, enabling it to pass vehicle readiness monitors without triggering a check engine light. An advanced molecular bonded wash process applies the precious metal coatings to ensure long-life reliability. Whether you're looking to improve the exhaust note from your 3.0T or building a track-destroying hybrid turbo setup, enjoy your exhaust without the annoying check engine light.
HIGH-FLOW DESIGN
No check engine light does not equal reduced power. The 6" 400CPSI CAT maintains optimal flow to support substantial power gains up to large and hybrid turbochargers. Your IE ProCore downpipe will pass vehicle readiness monitors and allow total and complete power, torque, and spool potential from your hardware and tuning upgrade investments.
ADVANCED ENGINEERING
Advanced 3D scanning tools and cutting-edge software provide our engineers with a high-resolution digital model of Audi's unique 3.0T engine. This data is then used to maximize the downpipe size for flow and ensure perfect and factory-like fitment.
CUTTING-EDGE MANUFACTURING
IE downpipes are manufactured with quality materials for lasting strength and performance. The T304L stainless steel investment cast body smoothly transitions exhaust flow from the massive 6" CAT to the dual 2.5" mandrel bent exhaust legs. All joints are hand TIG welded using precise fixtures and tooling for a seamless, leak-free fit.
HYBRID TURBO READY
The stock downpipe becomes a significant restriction when upgrading to a larger hybrid turbo. IE's cast downpipe is a direct fit to available upgraded turbochargers on the market and will unleash the complete horsepower, torque, and spool potential from your turbocharger investment.
Our IE B9 3.0T intake systems, turbo inlet pipe, and downpipe are hybrid optimized, making the installation of popular turbo upgrades an easy bolt-in process.
VEHICLE FITMENT GUIDE
| MAKE | MODEL | YEAR | ENGINE |
|
AUDI |
S4 |
2017-2024 (B9/B9.5) |
3.0T (Turbocharged) |
|
AUDI |
S5 |
2017-2024 (B9/B9.5) |
3.0T (Turbocharged) |
DYNO TESTING
Real-world power numbers are achieved using our in-house dyno cells to verify the efficiency of the downpipe design. Dyno testing performed in controlled conditions on a hybrid turbo equipped B9 S4 resulted in consistent and significant power gains of 45HP & 41FT-LBS to the wheels!
POWER GAINS OVER STOCK
The following chart details the power gains (WHP & WTQ) over the baseline power numbers taken from the stock downpipe on our hybrid turbo development S4.
The "0" baseline is the maximum power/torque made, and each following increment is the additional power gained from the IE downpipe upgrade.
The above power gains are a result of various design details:
The 6" 400 CPSI ProCore CAT improves exhaust flow.
The increased size of the downpipe body and smooth transition into the midpipes quickly evacuates exhaust gases away from the turbine wheel, improving turbocharger speed and efficiency.
The thick-wall investment cast body reduces radiant heat keeping the engine bay and charge air cooler.
INSTALLATION
Install your new downpipe kit without welding, cutting, permanent modifications, or installation hassles. The process is straightforward with the correct tools. If desired, the factory heatshield and engine cover reinstall with a perfect fit for a truly stealth look.
Install time around 2-3 hours
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
4.1 ★★★★★
Based on 20 reviews
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Product Reviews
★★★★★ 5
Great purchase!
Size: 6 Panel
I absolutely love this thing. I've had it for over a year now, and its held up beautifully. I used it in my apartment as a divider between a very large living room, and its worked great. Sturdy, no issues.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 7, 2025
★★★★★ 5
Quality
Exceptional quality. Very well made.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 20, 2025
★★★★★ 5
Attractive
Size: 6 Panel
Smells nice, looks nice. Used for screening light in my room and as background for online meetings.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 30, 2023
★★★★★ 1
Garbage!!!
Size: 6 Panel
The description of this item claims it is a room divider for patio privacy. The problem is that a little gust of wind and down it goes. Ther's not much privacy when it's always on the floor. This poor design needs some braces on the bottom to give it some stability and keep it from blowing over. Mine came damaged and the seller wanted me to pay $80 to have it shipped back to them despite uploading pictures of the broken hinge it came with. Take my advice, keep looking and don't settle for this one!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 28, 2022
★★★★★ 5
Stylish, Sturdy Shelves That Instantly Upgrade Any Bathroom
Size: 15.7", Color: Rustic Brown, Size: 15.7", Color: Rustic Brown
Beautiful, sturdy, and easy-to-install shelves that instantly make the bathroom look more organized and stylish.
These floating shelves completely transformed the look of my bathroom. The wood color is rich and warm, and once installed, the shelves look much more expensive than they actually are. They add both decoration and practical storage without taking up extra space.
Installation was straightforward, and everything aligned well. Once mounted, the shelves feel very sturdy. The toilet paper holder is especially useful, and the storage box has enough space for two rolls plus small decor pieces.
The shelves also have great weight capacity. I added decor, candles, and a picture frame, and everything sits securely. They really elevate the room, giving it a cleaner and more put-together appearance. The set arrives packed well, and the finish has no scratches or flaws.
For bathrooms, entryways, or small spaces, this set is an excellent choice. It’s functional, stylish, and adds instant charm to the room.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 12, 2025
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