If you’re looking to squeeze more speed out of your bike, there’s no shortage of performance products available for Harleys, whether they’re air intakes, exhaust and muffler kits, or camshaft upgrades. And if you’re just wanting to get your motorcycle going, period—rest assured, OEM replacement motor parts are readily available that can play a huge role in the case of an overhaul or rebuild.
So whether you’re wanting a power boost on your brand-new motorcycle or just need to maintain your higher-mileage hog, it’s important to choose the right components to accomplish your mission.
To enhance your bike’s breathing, we’ve searched out intake kits and exhaust packages made to increase horsepower and torque numbers, and for riders looking to rebuild their “experienced” Twin Cam engine over the course of the off-season, we’ve found stuff to help you there as well. Read on and discover how to add a whole lot of excitement and dependability to your trusty steed.
S&S Cycle’s Grand National 2-into-2 exhaust system for Milwaukee-Eight-equipped ’18–newer H-D Fat Bob models does its part in carrying that tradition into the future.
The Grand National exhaust system combines the 2:2 format with a hidden crossover that is geared toward total performance gains. Clean bends, stainless header tubing, and full shielding create an exhaust stem that cranks out real power with even torque delivery that’s surprising for a short tract system. S&S includes wideband O2 sensor ports, as well as removable secondary baffles that allow for custom-tuned sound and back pressure. The Grand National exhaust kit is available in chrome and black ceramic.
The Stage I Big Sucker system features a patented hidden breather backing plate technology, which wraps around the filter cleanly and securely, and a smooth radius air inlet for a wide-open airflow path. The high-performance filter element is available in either red or black pre-oiled cotton for the best filtration out there.
This muffler kit boasts about its use of high-quality, low-weight components, which will in turn reduce overall muffler weight. The full titanium construction, in combination with the carbon-fiber end cap and muffler shield reduces weight by 50 percent compared to stock components. This is where increases in performance and acceleration will come into play. Installation is a breeze as this muffler kit is simply a slip-on design.
The Rocket cams designed for the H-D Milwaukee-Eight come in four options—the Rocket 444, 464, 474, and 544, which all work at optimum performance levels, depending on the other power-making products (such as intakes and exhausts) that will also be in the equation. To see which one fits your M-8 application, take a look the Rocket Cams website and determine which camshaft will deliver the most horsepower and torque increases for your needs.
Drag’s Twin Cam cylinder is designed to be a direct replacement of the OEM units, and even features the same factory texture powdercoat with highlighted fins that further maintain an OG appearance. Miles add up quicker than you think, and to preserve the future of your favorite bike equipped with a 1999–2017 Twin Cam motor, do it a favor and reach for a new cylinder swap from Drag Specialties.