The HMF Swamp Series was designed for several reasons:

1. The most obvious is to handle the underwater riding conditions.  Most other mufflers including the HMF Utility Series does not keep water out.  The Swamp Series has a water tight canister and optional snorkel to allow you to submerge the muffler and go as deep as you want.  The Swamp Series is completely sealed and maintenance free --No packing to worry about soaking or burning out!
2. They muffler makes power, yet is quiet.  Typically, quiet and power never get along together.  The swamp series core design flows very close to the performance curves of the HMF Utility Series.  HMF Swamp Series are also designed to be nearly stock quiet!  This means you can ride in those areas requiring 100 dB and lower.
3. Meets EPA tier two emission standards of 2008-2010.  This means the manufacturers have to lower the emission output of their machines. Whenever that happens internal exhaust temperatures raise. We decided to design a muffler that will be up to the task of whatever temperature the manufacturers can throw at us.
   A stainless steel body can handle internal exhaust temperatures much higher than an aluminum body, which means as the manufacturers raise internal temperatures to meet the 2008~2010 EPA standard the body will be able to take the heat. --Source http://www.hmfengineering.com/forums/showthread.php?t=3233

Click here for HMF Swamp Series DYNO information.

The HMF Swamp Series exhaust is designed to go fender deep and features a five inch stainless steel, watertight canister.  It has a CNC milled removable end cap that is TIG welded for uncompromising durability.  These are a slip-on design exhaust system.

Get stock sound levels with huge horsepower increases with the Swamp Series. Add the Quiet Core insert to bring those noise levels down further.  Ideal for hunting and riding in state parks.

HMF Swamp Series Noise Level Test
Engine Speed	Stock Setup	Swamp Series	Swamp Series w/ Quiet Core	Swamp Series w/ Snorkel
Idle	85 dB	86 dB	83 dB	83 dB
2500 rpm	94 dB	95 dB	92 dB	92 dB
5000 rpm	98 dB	100 dB	94 dB	95 dB

The optional snorkel kit includes snorkel spigot with a welded flange, for a watertight system that can be submerged.  The snorkel simply installs into the exhaust end cap!

HMF Swamp Series Exhaust

Model	Year	Part Number	Price
CAN-AM
Renegade 800	'07-'11	H-BRE800SSR	$359.95
Outlander 650 (Spring)	'06-'11	H-BO650SSR	$359.95
Outlander 800 (Spring)	'06-'11	H-BO800SSR	$359.95
Outlander 800 (Clamp)	'08-'11	H-BO800CSSR	$359.95
Outlander 800 XMR Edition (Clamp)	'11-'12	H-BO808MCSSR	$359.95
Outlander Max 800 (Clamp)	'08-'11	H-BO808MCSSR	$359.95
Honda
Foreman 500	2005	H-HF50005SSR	$359.95
Foreman 500	'06-'10	H-HF50006SSR	$359.95
Rubicon 500	'01-'05	H-HR500SSR	$359.95
Rubicon 500	'06-'10	H-HR50006SSR	$359.95
Rincon 650	'03-'05	H-HR650SSR	$359.95
Rincon 680	'06-'10	H-HR680SSR	$359.95
Kawasaki
Brute Force 650 (i)	'06-'11	H-KBF650iSSR	$359.95
Brute Force 750	'05-'11	H-KBF750SSR	$359.95
Polaris
Sportsman 600-800 *Snorkel not available*	'02-'07	H-PS800SSR	$359.95
Sportsman 550/850	2009	H-PS850SSR	$379.95
Sportsman 550/850	2010	H-PS85010SSR	$359.95
Sportsman 550 X2	2010	H-PS550X2SSR	$379.95
Suzuki
King Quad 700/750	'05-'11	H-SKQ700SSR	$359.95
Yamaha
Grizzly 660	'02-'08	H-YG660SSR	$359.95
Grizzly 700	'07-'11	H-YG700SSR	$359.95
Rhino 700	2008	H-YRH700SSR	$379.95

NOTES: The HMF Swamp Series exhaust and HMF Swamp XL are not the same!  The Swamp Series XL (not sold here) is a much louder exhaust, similar to the HMF Utility Series exhausts, with noise levels that range around 102-105 decibels.