JHM High Flow Catted Downpipes With X-Pipe - Audi B8, B8.5 S4, S5, Q5, SQ5, C7 A6, A7, 3.0T and 4.2L V8

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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 sales@ngpracing.com. We cannot ship this product to you without a completed form.

Track Car Modification Waiver Form


Built as a direct OEM replacement, JHM Catted Downpipes with X-Brace are easy to install with simple hand tools with no cutting or welding required. the JHM X-Pipe is 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: These downpipes do not replace, but instead relocate the factory catalytic converter sections that are directly connected to the exhaust manifolds. Instead, these downpipes connect to the factory catalytic converter section. Please see the illustration in the images above for more information. If you have any questions, please contact us before placing an order for these downpipes.

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 downpipes.


  • JHM High-Flow Cats located further downstream
  • JHM V-Band Downpipe to X-Pipe 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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