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JHM High Flow Catted Downpipes With Integrated Baffles - Audi B8, B8.5 S4, S5, Q5, SQ5, C7 A6, A7, 3.0T and 4.2L

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This is a Race-only product. By adding this product to your shopping cart, you are electronically acknowledging that this product is not to be installed on any registered vehicle that will be driven on any US road, street or highway. In addition, you also acknowledge that the use or installation of this product outside of the intended closed circuit racing purpose may be illegal under the Federal Clean Air Act (42 U.S.C. § 7522(A)(3))

To purchase this product, you must fill out and e-mail the form at the link below to We cannot ship this product to you without a completed form.

Track Car Modification Waiver Form


The Integrated Baffle System Version of the JHM High Flow Catted Downpipes are for those looking for a quieter exhaust system. The baffles have been designed and strategically located in the downpipes to reduce unwanted drone and rasp (please note that this is also dependant on which cat-back exhaust system you have installed to your Q7, results may vary). JHM used popular exhaust systems for their trials (AWE Touring & Track) along with their JHM Race Pipes and were able to get the interior noise down to just 70db while cruising at 70mph in 6th gear at 2500RPM with the JHM Baffled Downpipes.  That is 10db quieter than the AWE Touring and 15db quieter than the AWE Track systems WITHOUT the JHM Baffled Downpipes installed.  During our testing, at 70db we heard more road/tire noise than exhaust. Note: The main purpose of the Integrated Baffle System is to combat unwanted drone and take the edge off rasp that may be produced by the exhaust gasses. 

Built as a direct OEM replacement, JHM Downpipes are easy to install with simple hand tools with no cutting or welding required. These downpipes are designed to increase low-end torque and maximize power throughout the entire RPM band. By moving the catalytic converters further downstream into the downpipes, JHM was able to take full advantage of their own 2.5" Race Pipes to alleviate heat build-up close to the engine. As a result, this increases Catalytic Converter longevity, as well as overall engine performance.

Please note that these downpipes are designed to re-locate the factory catalytic converters. You will need to either purchase a set of JHM Race Pipes (see links above for pipes that are applicable to your model) or modify your existing factory downpipes in order to properly install these.


  • JHM High-Flow Cats located further downstream
  • JHM V-Band Downpipe to Midpipe Connection for easy install
  • Direct OEM Fitment without modification



  • 2008-2012 Audi B8 S5 4.2L V8
  • 2013-2017 Audi B8.5 S5 3.0T
  • 2009-2017 Audi B8, B8.5 S4 3.0T
  • 2009-2017 Audi B8, B8.5 Q5, SQ5 3.0T
  • 2011-2018 Audi C7 A7 3.0T
  • 2012-2018 Audi C7 A6 3.0T

Please note that this product is for racing use only and is not to be installed or used with any vehicle that will be driven on the road. 

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