This popular muffler modification uses your factory 997 muffler, but adds a tube that bypasses part of the factory muffler for greater sound volume while still maintaining the exotic, "Euro" quality of the original Porsche exhaust note. Different from "hacks" that are discussed on the various forums, the Hanksville/HHR modification does not bypass the entire muffler. Rather, our mod provides a direct path for the exhaust through a portion of the internal chambering in the factory muffler. All of the exhaust still flows through the muffler, but almost bypassing one of the chambers. This results in a more aggressive "Euro" sound than many of the expensive full exhaust systems, but without as much raspiness that you would get from other full muffler bypass kits. So, our HHR muffler bypass gives you a great sound at a reasonable price compared to other exhaust systems. Check this comparison video from one of our customers:
This kit includes two mandrel-bent bypass tubes made from 2" 304 stainless steel tube. Both bends have been cut, notched, and test-fitted onto actual 997 mufflers to ensure a quality fit. You would install and weld onto your mufflers using our included instructions. Muffler removal and reinstallation required. This is an easy modification that you can perform yourself if you have access to a welder, or you can have these welded at your local shop.
If you would prefer to send your mufflers to us, we offer a service to install/TIG-weld this kit onto your mufflers and ship back to you. Just choose the applicable installation option.
Pricing includes the cost to ship our bypass kit to the Continental US; this does not include the cost to ship your mufflers. If you are outside of the Continental US, please contact us for overseas shipping costs. Thanks, and as always please let us know if you have any questions.