HMF Engineering
Encyclopedia
HMF Engineering, Inc. is a world-wide manufacturer and distributor of ATV, UTV, Dirtbike, and Motorcycle after-market exhaust system
Exhaust system
An exhaust system is usually tubing used to guide reaction exhaust gases away from a controlled combustion inside an engine or stove. The entire system conveys burnt gases from the engine and includes one or more exhaust pipes...

s. HMF develops performance exhaust systems in a variety of different exhaust series. Each individual exhaust series creates different horsepower, torque, and sound levels, making each one different from each other. HMF Engineering manufactures after-market exhaust systems for Honda, Suzuki, Kawasaki, Yamaha, Can-Am, KTM, Polaris, Kymco, and Arctic Cat ATV's (all-terrain vehicle
All-terrain vehicle
An all-terrain vehicle , also known as a quad, quad bike, three wheeler, or four wheeler, is defined by the American National Standards Institute as a vehicle that travels on low pressure tires, with a seat that is straddled by the operator, along with handlebars for steering control...

s) and dirt bikes as well as Honda, Suzuki, Yamaha, Kawasaki, BMW, and Ducati motorcycles.

Company history

HMF Engineering was founded in 1997 by Hans Luenger in Cleveland, Ohio. Hans started the company by himself in his garage building private label aftermarket performance Ducati Motorcycle exhausts for Fast By Ferracci. As the workload increased, Hans hired three friends and bought a building in Brooklyn, Ohio in 1999 to help with the manufacturing process and diversify the product line. In addition to the Ducati exhausts, HMF began to produce its own line of high performance aftermarket exhausts for the Honda RC 51 motorcycle and the Honda 400EX ATV. To better understand the market, Hans started racing motorcycles in 1999 and expanded the product line of sport and street motorcycle exhausts to better serve the sport he was competing in.

After refinancing his house three times between 1999 and 2002 and selling his Corvette and FZR 1000 to keep the business alive, HMF reinvented itself once again by plunging into the ATV exhaust market in late 2002. The early HMF ATV exhausts were made using the technology and sophistication used in street bike exhausts.

Competition

Available for Sport ATVs and dirt bikes, the HMF Competition Series features the TriMax Core. The Trimax core is in fact a triangle shape. Available in high-tempered Black Aluminum, the Competition Series features a Stainless Steel Euro End Cap (round or elliptical). Stainless Steel rivet bands are wrapped around the shell and air riveted in.
The exhaust comes with three removable inserts. These inserts are designed to alter the horse power, torque, and sound differently.

Performance

The Performance Series has an unrestricted core, allowing the system to increase power evenly throughout the RPM range.

Penland Pro

Backed by the ATV legend Mike Penland, the Penland Pro Series was developed for off road racers and trail riders. The Penland Pro comes with a Torque Range Modifier. The removable Torque Range Modifer increases power in the low-to-mid RPM Range.

Swamp Series

The Swamp Series has a 5 inches (127 mm) shell. It gives the exhaust more internal volume to produce larger horse power gains. The mechanical core directs and controls sound pulses to keep sound levels approximately 1-2 dB over stock exhaust systems. Its shell is made of 304 stainless steel and the inlet is TIG-welded shut for a water tight seal.

Swamp XL

The younger brother of the Swamp Series, the Swamp XL (extra loud) offers slightly more horse power than the standard Swamp Series. It has a non-restrictive core. Since there is nothing inside the core controlling sound pulses, the exhaust's dB levels are high.

Quiet Race Series

The Quiet Race Series features has a internal mechanical core that controls sound pulses and manages them to a minimum. The Quiet Race Series' core is designed to meet sound regulations in most restricted riding areas.
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