This information applies to Harley-Davidson® enthusiasts only. When it comes to your baby only professional, high quality replacement parts for your Harley-Davidson® Screaming Eagle motorcycle are acceptable. When performing maintenance, the quality of replacement parts is critical. The performance of your bike, including getting the most amount possible of torque and horsepower depends heavily on the type of parts you replace on your machine. Click here to learn about DohertyMachine. An innovator in high quality, high performance after market replacement parts for Screamin'Eagle motorcycles Click on any of the images or the link above to learn about the high performance after market parts designed by Tim Doherty and Doherty Machine's specifically for Harley-Davidson Motorcycles. Doherty Machine is a company owned by Tim Doherty. As many people in the world of HD know, Tim Doherty has been winning awards for replacement parts he has been engineering and manufactoring for over 20 years. Tim and Doherty Machine's products are often reviewed by Easyriders Magazine, American Rider, StreetChopper, ThunderPress, American Iron and V-Twin. Tim creates and manufactors high quality replacement parts for air filters, oil filters, and wide-tire kits. Visit DohertyMachine.com and discover the hardware that will increase the torque and horsepower of your machine. Don't take our word for it. Visit the homepage of the website and read the actual articles written by industry professionals about Doherty Machine and the effect their products have on motorcycles.