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Audi B9 S4 / S5 Downpipe

New product

B9 S5 Downpipe Video HJS 200

REDSTAR performance downpipe for the new 2017+ B9 S4 & S5 3.0 TFSI with single-turbo engine. Our downpipes utilizes a big bore design with smooth transitions for maximum flow and efficiency. REDSTAR is the only manufacturer who offer so many modifications to choose from. It allows you to get the downpipe that exactly matches your needs and budget. 

More details


  • No Heat Shield
  • Includes Heat Shield
  • Catless
  • HJS 200cpsi
  • GESI GEN2 400cpsi
  • No Gaskets
  • Include Gaskets

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Compatible Vehicles:

  • 2017- Audi S4 B9 
  • 2017- Audi S5 B9

*Available Options:

  • Ultra high-performance 200 cell HJS HD (Euro 5), best in power and performance. Made in Germany, metal core catalytic converters.
  • GESI GEN2 400cpsi 5"- catalytic converters rated for 1000hp. The new GEN2 series provides a significant improvement in exhaust flow over stock and offers the latest emissions technology. EPA Compliant catalytic converters have been third-party lab tested to meet or exceed local emissions standards in North America (excluding California) and will address Check Engine light issues with proper engine setup. (No CEL)
  • OEM-style Heat Shielding with ceramic inner liner - the best way to reduce radiant heat up to 70%. Usual thermal wraps or coats not even close in effectiveness and durability to the Heat Shields. Must have option for the modern temp sensitive turbo engines.
  • Optional Gasket Set - 2 Lower 

Main Features:

  • Significant power gain
  • Faster spool up and better throttle response
  • Increasing the life of the turbos 
  • Reducing under hood temperature
  • Adds a very nice tone to the exhaust
  • 100% bolt-on installation
  • 100% TIG welded and back purged
  • Highest quality 2.0mm wall 304 stainless steel
  • OEM-spec V-band flanges
  • All brackets and mounts as on OEM unit


Removing of factory catalytic converters will trigger a сheck engine light. Firmware update recommended to get maximum performance gains. 

This product is not designed to meet any emissions standards and is not for street or highway use. This product is not certified and may not be legal for use on emissions controlled vehicles in any country/jurisdiction.

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