Engineered as the ultimate downpipe solution for your Audi B9/B9.5 S4 or S5, every detail is maximized to provide the turbo and engine with a completely unrestricted exhaust flow path for up to 45HP & 41TQ (on hybrid turbo setup). The TIG-welded 304 stainless and investment cast body delivers addictive sound, quality finish, effortless install, reliability, and maximized performance for your turbocharged V6.
- Refund Policy
HYBRID & STOCK
- Required to support hybrid turbo ECU calibrations
- High-flow design to support full-bolt on stage 2 power capabilities
- Removes any downpipe restrictions for full available power
- Increases exhaust sound with improved engine & turbo notes
- Improves turbocharger efficiency & speeds up turbo spool
- Thick-wall casting reduces radiant heat in the engine bay
- 200 CPSI performance high-flow catalytic converter
- 304 investment cast downpipe body
- 304 stainless steel downpipe legs & CAT
- Massive 6" downpipe body to dual 2.5" downpipe legs
- Hand TIG-welded for superior reliability and surface finish
- Direct bolt-in factory replacement
- CNC machined v-band and bolt flanges for leak-free operation
- Installs to the stock exhaust or IE Midpipes upgrade
*Requires Stage 2 or hybrid turbo ECU tuning
IE's unique thick-wall investment castings produce an aggressive, drone-free exhaust note without the "tinny" sound typical on most full stainless body aftermarket options. Enjoy not only a louder exhaust but one with improved engine and turbo notes that will deliver miles of smiles.
Other aftermarket downpipes use large sections of thin-wall steel tubing to manufacture the downpipe body; this is a cheaper process but can reduce sound quality and sacrifice exhaust flow. Investment casting allows for an optimized design that smoothly transitions exhaust flow from the massive 6" body to the dual 2.5" exhaust legs. The casting also provides a beautiful look that turns the entire downpipe into an attractive gold finish as it wears in from heat cycles over time.
The B9 3.0T hot-v style engine has a unique center-mounted turbo with a large downpipe that quickly splits into twin-sided exhaust sections. This challenging configuration requires exacting alignment to avoid install hassles, rattling, rubbing, and exhaust leaks. IE engineers utilize advanced 3D scanning technology and rapid prototyping to guarantee a flow-maximized design that exceeds even the factory fitment.
200 CPSI CATALYTIC CONVERTER
IE's downpipe includes a high-flow 200 CPSI catalytic converter. This performance CAT allows for full and unrestricted power from Stage 2 ECU tunes and hybrid turbo upgrades while reducing emissions output and eliminating unwanted smells and bumper stains found on cat-less designs.
Catalytic converter warranty is only available for cusotmers running IE performance ECU software.
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 allow total horsepower, torque, and spool potential from your turbocharger investment.
IE's B9/B9.5 S4 & S5 intake system, turbo inlet pipe, and downpipe are hybrid optimized, making the installation of popular turbo upgrades an easy bolt-in process.
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!
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" 200 CPSI racing 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.
To learn more about each of these features, click the design tab above.
Install your new downpipe kit without any welding, cutting, permanent modifications, or installation hassles. The process is straightforward with the correct tools.
Install time around 2 hours
VEHICLE FITMENT GUIDE:
CONSUMER NOTICE: BY PURCHASING A MOTORSPORT/RACING PRODUCT ("PRODUCT"), YOU REPRESENT THAT YOU UNDERSTAND AND AGREE THAT: THE PRODUCT IS NOT DESIGNED TO MEET ANY APPLICABLE EMISSIONS STANDARDS, WHETHER IN THE USA OR OTHERWISE, THE PRODUCT IS NOT C.A.R.B. COMPLIANT, AND THAT THE PRODUCT IS NOT FOR SALE OR USE IN CALIFORNIA, USA NOR ANY OTHER JURISDICTION WHERE THE SALE OR USE IS PROHIBITED BY LAW. INTEGRATED ENGINEERING, LLC MAKES NO REPRESENTATIONS, WARRANTIES, OR CLAIMS THAT THIS PRODUCT COMPLIES WITH ANY APPLICABLE EMISSIONS LAWS AND EXPRESSLY DISCLAIMS ANY AND ALL SUCH REPRESENTATIONS, WARRANTIES, AND CLAIMS, WHETHER EXPRESS OR IMPLIED. BY PURCHASING THIS PRODUCT, YOU REPRESENT, WARRANT, AND AGREE THAT IT IS YOUR RESPONSIBILITY TO INFORM YOURSELF OF ANY LAWS OR REGULATIONS THAT MAY APPLY TO YOUR PURCHASE AND/OR USE OF THE PRODUCT.
Our policy lasts 14 days. If 14 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.
* Customer must pay for the shipping to the original manufacturer.
Several types of goods are exempt from being returned. Perishable goods such as food, flowers, newspapers or magazines cannot be returned. We also do not accept products that are intimate or sanitary goods, hazardous materials, or flammable liquids or gases.
Additional non-returnable items:
* Gift cards
To complete your return, we require a receipt or proof of purchase.
Please do not send your purchase back to the manufacturer.
There are certain situations where only partial refunds are granted: (if applicable)
* Book with obvious signs of use
* Any item not in its original condition, is damaged or missing parts for reasons not due to our error.
* Any item that is returned more than 14 days after delivery
Refunds (if applicable)
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.
Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at firstname.lastname@example.org
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at email@example.com labelled as “Defective Item”
If the item was marked as a gift when purchased and shipped directly to you, you’ll receive a gift credit for the value of your return. Once the returned item is received, a gift certificate will be mailed to you.
If the item wasn’t marked as a gift when purchased, or the gift giver had the order shipped to themselves to give to you later, we will send a refund to the gift giver and he will find out about your return.
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.
Depending on where you live, the time it may take for your exchanged product to reach you, may vary.
If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.