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329

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