Grizzly 660 (02-08)
Grizzly 660 (02-08) Grizzly 660 (02-08) Grizzly 660 (02-08)

Yamaha

Grizzly 660 (02-08)

Price: $289.95

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* Production Time: 7-10 Business Days (?)
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Note: HMF Exhausts are designed for closed course competition only.

For detailed information about exhaust options, click the (?) next to each of the options above. If you have further questions or concerns, contact our online custom service department or call 1.866.HMF.PIPE.
Note: Orders placed after 9AM EST are processed next business day.

The Yamaha Grizzly 660 has a patented five-valve cylinder engine design that produces a potent combination of low-rev torque, right-now throttle response and high horsepower. We were pumped when we seen horse power increases with both Slip On and Full Systems. Designed for the serious riders, these exhaust systems will give you as much power as you can handle.

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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.

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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.

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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.