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REDSTAR performance downpipes for the new 2018- Audi B9 RS4 / RS5 with Porsche twin-turbo 2.9 engine. Our downpipes utilize big bore design with smooth transitions for maximum flow efficiency. Long cones used to reduce the OEM 127mm turbo flanges to 89mm main diameter, which then goes down with second transition to 76mm lower 3-bolt flanges.

Compatible Vehicles:

  • 2018- Audi RS4 8W B9 2.9 TFSI
  • 2018- Audi RS5 F5 2.9 TFSI

Available options:

  • HJS Ultra High-Performance catalytic converters. Made in Germany most reputed high flow converters for their outstanding characteristics, quality and durability. We offer selection between 100cpsi Motorsport grade matrix, 200cpsi Euro5 HD matrix or 300cpsi Euro6 HD matrix. While in most cases 200cpsi HD converters is the best choice, only bigger 300cpsi Euro6 converters guarantee no CEL operation. >> Read more about HJS cats.
  • GESI UHO 300cpsi made in Canada catalytic converter rated 500-850hp with 4.5in core diameter. Provides a significant improvement in exhaust flow over stock. GESI is the well known brand on the market with perfect price/quality ratio. EPA certified for use on OBD2 vehicles (1996 and newer) 49 States. 
  • Double-layer heatshielding is used to protect surrounding parts, wires, and hoses against radiant heat from the downpipes.
    Integrated thermal insulation reduces surface temperature up to 70%! What makes it an absolute winner, compared to usual thermal wrapping or ceramic coatings.
    It’s very important not just for safety reasons but also affects engine performance by reducing the underhood temperature. We highly recommend this option, especially for catted downpipes.

Main Features:

  • Significant power gain
  • Faster spool up and better throttle response
  • Increasing the life of the turbos 
  • Reducing underhood temperature
  • Adds a very nice tone to the exhaust
  • 100% bolt-on installation
  • 100% TIG welded and back purged
  • Highest quality 2mm wall 304 stainless steel
  • OEM-spec flanges
  • All brackets and mounts as on OEM unit

Why Buy Our Products?

You buy directly from the manufacturer and all the products 100% handmade in Russia. Not just another relabeled China/Taiwan stuff.
We don't compromise on quality! No mild steel flanges, no weak clamp joints, no other cost reduction tricks.
Free flow is our priority! No steps and restrictive areas, only smooth transitions, bigger diameters, and optimized design.
Our welds and whole craftsmanship better than most of the competitors. Pictures speak for themselves.
5-year warranty against any defects given to the original owner.


We offer WORLDWIDE shipping via EMS Express (USPS Priority Mail International) from Russia. It usually takes 8-18 days to any destination.

Shipping from our US representative is a possible option for some products. Please, ask for details and availability. 


*This product is not designed to meet any emissions/noise 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. This product is NOT C.A.R.B. compliant and not for sale or use in California, USA. All the new cars have different ECU calibrations at different countries. While we claim HJS catted downpipes as a CEL-FREE modification, we can't 100% guaranty no error codes for all makes and models worldwide.