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4-STROKE SILENCERS
Every DR.D Step System exhaust is manufactured from high-quality,
304-series stainless steel. Each step in the exhaust pipe is achieved via a
precision machined ring that not only adds to the performance, but gives the
DR.D pipe a distinctive look. The complete system is purged and welded in
one of the nation’s best manufacturing facilities.
The muffler is constructed out of 6063 aluminum to lower the overall weight of
the system and provide an aggressive, but pleasant, exhaust note. DR.D used
a “pillow” exhaust packing method to guarantee U.S.F.S. spark arrestor to allow
you to use your ATV in a wide range of locales.
The unique attributes of the DR.D’s step system is that it allows for a more
efficient intake stroke. It does this by resisting the reflective exhaust pulse
during the intake/exhaust overlap. In plain language, the carefully tuned steps
in the system allow for a lower net cylinder pressure, which gives a crisper
throttle response from bottom to top. The key advantage of the Step System
is improved low end response with substantial gain in the mid and top ranges.
Dyno tests show a 3.6 horsepower increase at peak.
Original end cap shown
Application
WPS# List
QUIET INSERTS
-5db
78-8002 $54.95
REPACK KITS
USFS S/A Kit
78-8014 $16.95
Repack Pillow Kit (12.75” to13.5” canister)
78-8015 32.95
Repack Pillow Kit (14” to 15” canister)
78-8016 32.95
Repack Pillow Kit (16” to 17” canister)
78-8017 32.95
*
Complete exhaust system
‡
New style end cap
#
Dual complete exhaust system
Application
Year
Spark
Arrestor/
Silencer
List
Headpipe
List
HONDA
TRX450R
‘04-05
78-07543
*
$637.95
‘06-10
78-07439
*‡
637.95
KAWASAKI
KFX450R
‘08-12.
78-07445
‡
$395.95 78-8126 $252.95
YAMAHA
Raptor 125
‘11-12
78-8178 $219.95
YFM250 Raptor
‘08-12
78-8177
219.95
YFZ450
‘04-16
78-8166
252.95
YFZ450R
‘09-17
78-8176
252.95
Raptor 660
‘01-06
78-07620
$395.95
Raptor 700
‘06-17
‡
78-8173 $274.95
Not legal for use in California on pollution controlled vehicles,
race use only in California - waiver available
EXHAUST
TIRES
WHEELS
WHEEL /
TRACKKITS
TIREACC.
WINCH
PLOW
TOWING /
FARM
UTVCAB /
ACCESSORIES
AUDIO
WINDSHIELDS
ATVBODY
UTVBODY
STORAGE/
TRANSPORT
EXHAUST
BARS /GRIPS
LEVERS
CABLES
ATVCONTROLS
FUEL /
AIRSYSTEMS
AIRFILTERS
OILFILTERS
LIGHTING
ELECTRICAL
SPARKPLUGS
BATTERIES
CHARGERS
ENGINE
SUSPENSION
DRIVE
CHAIN
SPROCKETS
BRAKES
CHINESE
VEHICLEPARTS
CHEMICALS
TOOLS
LOCKS
TRAILERS
RAMPS /
STRAPS
PROMOTIONAL
REFERENCE
INDEX