Are you ready to radically transform the driving experience in your D4 Audi S8? Take your understated stock exhaust and replace it with our ECS in-house engineered Valved Cat-back Exhaust System! Our proprietary valved muffler design allows you to toggle between a mild-mannered, sporty Euro exhaust note with the valves closed, to a deep, aggressive sound with the valves open. Experience true driving passion with our ECS Valved Cat-back Exhaust System!

This exhaust system is constructed from 2.75” (70mm) CNC mandrel-bent 304 stainless steel with fully TIG-welded joints and a brushed finish - balancing durability, performance, and appearance. It features reinforced downpipes with interlock flex sections for longevity, while the thinner-wall midpipe and axle-back sections reduce overall weight. An integrated X-pipe enhances exhaust flow, with an optional center resonator available for a more refined exhaust note. Additionally, our system retains the factory exhaust valve motors for a seamless fit and smooth operation.

Sound clips! Check out this product highlight on the ECS Tuning YouTube channel:

DESIGN:

• 2.75” (70mm) 304SS CNC mandrel bent construction, fully TIG welded with brushed finish.
• Integrated center X-pipe
• Optional center resonator for more refined sound
• ECS designed muffler and resonator internals
• Allows for MMI control and operation of the valves
• Utilizes factory exhaust hangers throughout system
• All required gaskets, hardware, and clamps included with kit
• Utilizes factory exhaust valve motors to integrate into the OE valve controller
• Quad tip outlets with 4” ECS swivel tips 

KIT CONTENTS:

• Downpipes (direct bolt-on to factory cats)
• Resonator OR res delete section
• Packaged midpipes
• Integrated x-pipe
• Valved rear mufflers
• OEM exhaust gaskets (2)
• Exhaust flange nuts (6)
• ECS quad exhaust tips (your choice of finish)
• Accuseal style exhaust clamps (10)
• M8 x 1.25, 16mm long hex head screws (2)

PRODUCT DEVELOPMENT

• Our ECS Tuning Cat-back Exhaust System was designed, engineered, tested and quality inspected by our Research and Development team in our Wadsworth, Ohio facility. We strive for the highest level of precision and quality through leading-edge product development technology including FARO laser scanning for reverse engineering and quality inspection, SolidWorks 3D CAD modeling, rapid prototyping utilizing our in-house 3D printer, and rigorous long term product testing. 

INSTALLATION AND SUPPORT

• Looking for installation tips? Look no further, we put together a full installation tutorial from start to finish including how to remove your OEM parts! See our Installation PDF under the INSTALLATION Tab for more information.