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40TDP
The ARM 4.0T Downpipes immediately improve backpressure in your exhaust system,allowing your Audi 4.0T turbos to spool faster and generate more power lower in the RPM range.
The OEM 4.0T downpipes incorporate two large coffee can- size catalysts which reduce exhaust flow and power from your 4.0T. By replacing your OEM 4.0T downpipes with the ARM 4.0T downpipes you will eliminate this restriction and free up exhaust flow.
Another drawback of the OEM downpipes is they are designed to cross over each other. The driver side turbo connects to the passenger side midpipe, and vice versa on the opposite side. This forces the exhaust gasses to take a long pathway with several sharp kinks and turns. The ARM 4.0T downpipes begin and end on the same side to improve airflow and shorten the travel-path of the exhaust gasses. This results in faster turbo spool, more torque, and improved throttle response.
The ARM 4.0T Downpipes are built from SS304 stainless steel to ensure build strength and weld integrity for the life of your Audi 4.0T. You will never need another set of downpipes again!
Starting at the turbos, the ARM 4.0T downpipes are made from one solid 4.4" x 3" collector for durability. This collector is welded to an OEM-style 5-Bolt flange that will fit any turbocharger upgrade for the 4.0T platform. 
The ARM 4.0T Downpipes include a stainless steel flex section to relieve stress from the turbos during aggressive acceleration, cornering, and braking.
The ARM 4.0T Downpipes utilize the OEM transmission mounting brackets to further secure them in place during aggressive driving.
The ARM 4.0T Downpipes transition to a 2.25" 3-Bolt flange to match up perfectly to the OEM Midpipes or the ARM 4.0T Midpipes.
While the ARM 4.0T Downpipes enhance the sound of your exhaust dramatically, if you are looking to take your exhaust note to the next level, the ARM 4.0T Midpipes are an easy upgrade to further open up the incredible sound of your 4.0T. 
Audi designed the OEM midpipes with dual resonators to suppress the sound of your 4.0T. While that may be desirable for some drivers, as an enthusiast you want to hear more of the amazing sound generated by the twin-turbo V8 under the bonnet. The ARM 4.0T Midpipes do exactly that. If you install the upgraded midpipes while installing the downpipes, it only adds approximately 10 minutes to the installation, making it the perfect time to install the midpipes.
| Make | Chassis | Model | Engine |
| AUDI |
C7 |
S6 |
4.0T |
| AUDI |
C7 |
S7 | 4.0T |
| AUDI |
C7.5 | S6 |
4.0T |
| AUDI | C7.5 | S7 | 4.0T |
| AUDI | D4 | A8 | 4.0T |
| AUDI | D4 | S8 | 4.0T |
| AUDI | C7 | RS7 | 4.0T |
| AUDI | C7.5 | RS7 | 4.0T |
United StatesOutstanding product & customer service.
United StatesThey were super helpful with questions I had prior to purchase. That’s the sole reason I went with them. They seemed very confident in the parts they sell and now I see why. A++
Amazing quality and superb value. I got the downpipes and added the midpipes package. Sounds perfect even with factory mufflers. Just purchased the inlets and intake package as well! Can't wait to see what the guys come out with next as well! Extremely pleased!
United StatesI installed these in about 5 hours while taking my time and having a lunch break. The quality of the materials and construction is excellent, no nasty rough edges anywhere. I only purchased the downpipes so the exhaust note wasn't dramatically changed, it still sounds stock with just a little growl when under load. This is exactly what I wanted and the price is a no brainer. The only thing I didn't like is that the driver side flex portion contacts the firewall/heat shield and the side mounting tabs don't really align with the stock mounting points. Overall I am very satisfied with my purchase. 2013 Audi S6 stock non-sport cat-back.
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