Though there are more than 10 custom exhaust systems for Harleys on the market, the Thunderheader holds the distinction of being the only system used by Harley on its racing model.

German custom garage Thunderbike is responsible for making this Sportster-based custom called Silver Streak, extras parts worth $5,000 ...

One such example comes from Tennessee-based Moonshine Harley. The shop has whipped up a custom CVO Road Glide ST that ...

This Sportster chopper features a custom seat pan upholstered by Anderson Custom Interiors. Adding aural drama to this build is a custom stainless steel exhaust system featuring a 2-to-1 tailpipe ...

When it comes to car exhaust and performance mufflers, Flowmaster exhaust systems are legendary. We install a dual exhaust system and Flowmaster muffler on a Ford Galaxie - Custom Rodder Magazine ...

This Harley also showcases lowered handlebars for a more aggressive riding position, and the custom exhaust has headers wrapped for a classic appearance. Warr’s badging adds an attractive touch, ...

The exhaust system is also of Thunderbike make, designed specifically to run with Milwaukee-Eight engines, and comes as a complete kit with header and muffler.

In terms of horsepower, that puts the Harley roughly on par with a Suzuki Hayabusa (190 hp). In terms of torque, it outguns every production motorcycle we can think of. Only the Triumph Rocket 3 R ...