The OEM 4.0T downpipes incorporate two significant coffee can-size catalysts, which reduce exhaust flow and power from your 4.0T. Replacing your OEM 4.0T downpipes with the ARM 4.0T Catted downpipes will eliminate this restriction and free up the 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 mid-pipe and vice versa on the opposite side. This forces the exhaust gasses to take a more extended pathway with several sharp kinks and turns. The ARM 4.0T Catted 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.

CONSTRUCTION

The ARM 4.0T Catted Downpipes are built from SS304 stainless steel to ensure build strength and weld integrity for the life of your Audi 4.0T. They feature a 200-cell catalyst replacing the large factory units. Starting at the turbos, the ARM 4.0T Catted 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 turbo upgrade for the 4.0T platform. The Kit includes a stainless steel flex section to relieve stress from the turbos during aggressive acceleration, cornering, and braking. They also feature OEM transmission mounting brackets to secure them during aggressive driving. The downpipes transition to a 2.25" 3-Bolt flange to match up perfectly with the OEM Midpipes or the ARM 4.0T Midpipes.

Product Includes:

• 2x ARM 4.0T Downpipes
• 2x ARM Turbo Gaskets
• 2x ARM Midpipe Gaskets
• 10x Replacement Turbo Studs
• 10x Turbo Stud Nuts
• 6x Midpipe Bolts
• 6x Midpipe Nuts

Note:

This kit requires a Stage 2 Remap to eliminate any check engine lights due to the removal of the factory catalyst.

NEXT-LEVEL EXHAUST HARMONICS

While the ARM 4.0T Catted Downpipes enhance the sound of your exhaust dramatically, if you want to take your exhaust note to the next level, the ARM 4.0T Midpipes are an easy upgrade to 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. In contrast, that may be desirable for some drivers; as an enthusiast, you want to hear more of the fantastic sound generated by the twin-turbo V8 under the bonnet. The ARM 4.0T Midpipes do precisely 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.