Installing your catback to your stock downpipe? We made the job easy, everything needed to simply bolt your 3.5" catback to the stock downpipe is included in the optional IE Y-Pipe Kit.
*IE Y-Pipe Adapter sold separately.

Easy Sound Control
The built-in valve system is fully controlled by the factory drive select button just like stock without the need for finicky Bluetooth apps or cumbersome key fobs. Simply select comfort to drive around your suburb like a civilized neighbor -or select dynamic to blow their ears out with that 5 cylinder roar!
*Retains dynamic, comfort, individual, and auto modes.
Open Exhaust Valves
With the exhaust valves in their open setting (dynamic mode) the exhaust flows from the main 3.5" pipe into dual 3" pipes and directly out the back unrestricted. This setting offers both the highest flow and loudest sound possible from your exhaust.

Closed Exhaust Valves
Cruising in comfort mode closes the dual exhaust valves forcing the exhaust to flow from the single 3.5" center pipe into the muffler and out twin 2.5" pipes. This keep the sporty exhaust note, but with a dramatically reduced stock-like noise level.
Precision Fit
IE engineers use 3D scanning tools to create a digital duplicate of the vehicle's under body. This provides an incredibly high resolution environment to reverse engineer and rapid prototype a performance exhaust that not only takes advantage of every millimetre of available room, but also results in a perfect fit and easy installation.
Superb Craftsmanship
Each IE catback is manufactured from the highest standard 304L stainless steel, mandrel bent, and TIG welded by hand all using precise fixtures and tooling. We take great pride in knowing your new exhaust is built to last a lifetime.
Technology Meets Art
Cutting edge engineering and craftsmanship have blended together at every step from design to manufacturing delivering the highest quality surface finish, fit and material brightness. The exhaust tips feature horizontal, vertical, and depth adjustments so you can perfect them exactly as you wish. Not only will your exhaust sound and perform amazing, it will look the part as well.
Audi 8V.5 RS3 2.5T FSI (2017+) - Saloon only
Does not fit Sportback
IEEXCQ2 (Polished Exhaust Tips)
IEEXCQ4 (Satin Black Exhaust Tips)
Manufactured by
Integrated Engineering (IE)
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