If you’re looking for more power on your Arctic Cat 500/400 (TRV), the HMF Slip On Exhaust system takes full advantage of Arctic Cat’s power istribution. You can expect a 10-15% horsepower gain with the proper, recommended jetting.

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Exhaust Series We Recommend:

Swamp Series The Swamp is great for it's large mechanical core that directs and controls sound pulses to keep sound levels approximately 1-2 dB over stock. Learn More

Other Exhaust Series Available:

Performance Series	Penland Pro Series	Swamp XL Series
The HMF Performance Series has a specially designed, unrestricted core that allows the exhaust to increase power evenly throughout the entire power curve. It also features the signature HMF sound with industry-leading end cap and color options, giving you a completely custom look. Learn More	Backed by ATV legend Mike Penland, the Penland Series was developed for serious off road racers and trail riders striving to achieve more low end torque. The Penland features the same core as the Performance Series, but features the removable TRM that allows quads to hook-up in rough conditions. Learn More	The younger brother of the Swamp Series, the Swamp XL Series (extra loud) offers anywhere between 1-2 more horse power than the standard Swamp Series. What makes the Swamp XL different than the Swamp Series is the non-restrictive core that produces very high dB sound levels. Learn More

Each HMF Exhaust:

Inlcudes a USFS Approved Spark Arrester. Includes a 2 Year Limited Manufacturer’s Warranty. Is made of high quality Aluminum, Stainless Steel, or Carbon Kevlar. Packed with high performance glass wool packing. Includes Installation Instructions. Manufactured in the U.S.A.

Don't Forget:

Whenever you add an after-market exhaust system to your machine, tuning your carburetor is, in most cases, an absolute necessity. The proper jets and EFI settings are extremely important for the performance and lifespan of your machine. Tuning Kits are available to ensure your machine runs at it's top performance and your HMF Warranty remains valid.

HMF Recommended Jetting for 400/500(i): TRV (06-08)

2006-2008: Slip On: 135 Keihin Round, 45 Pilot

• These settings were determined on our dyno at 900ft - 60°F
• Improper air fuel ratio can lead to engine and/or exhaust system damage not covered under warranty.

Tuning Kits Available:

Basic Jet Kit	Trail Kit	Track Kit
The HMF Basic Jet Kit includes all the necessary jets to set your carburator to the proper settings. This will protect your exhaust, your engine, and give you maximum performance. Learn More	The HMF Trail Kit includes the HMF EFI Optimizer and a Uni Foam Air Filter that will increase air flow and give your machine optimum performance and maximum efficiency. Learn More	The HMF Track Kit includes the HMF EFI Optimizer and a K&N Air Filter to increase the efficiency of your machine and run at an extremely high performance rate. Learn More

Resources for 400/500(i): TRV (06-08)

• Installation Instructions