Diesel World – October 2019

Whilethecosmeticsofthefactorytailpipehasbeenmuchimprovedonthe2017+

Duramaxovertheearlier’08-’16modelyeartrucks,it’sstilla bitofaneyesoreonan

otherwiseclassylookingtruck.Becausethedieselparticulateemissionssystemswill

runextremelyhot—andtheventedtipis a necessity—thereareaftermarketanswersto

maintainfunctionalitywitha littlebetterstyle.

TheventedtipwasdevelopedbytheOEMengineerstoreducetheexhaustgas

temperaturetoasclosetooutsideambientairtemperatureaspossiblebeforeit exitedthe

system.Becauseit’scommontosee500+degreesaftertheDieselParticulatefilter,getting

thosetempsdownquicklyis keytopreventinjury,burn,orevencreateda grassfirefrom

theheatresonatingfromthesystem.

Aftercuttingthefactorytailpipesectionoff,thethreerubberhangersarepriedoffandthesectionis slippedup

overtheaxleandslidoutoftheway.SittingnexttothenewstainlesssteelMBRPsystem,youcanseehowlittle

thereis tothisinstall.Plus,youjustknowthatdual-exittipis goingtolookgreathangingundertherearfender.

offeredpowerandtorquewhilemaintaininggreatmileage

andquiet,smooth-runningengines.

In2004,theyreleasedthefirstfullproductionrunof

emissions-equippedDuramax,theLLY,whichhaditsown

EGRsystem.ThencametheLBZplatformin2006,which

tookwhattheylearnedaboutemissionsequipmentandthe

platformitselfandimprovedonit ineveryway.Somestill

considertheLBZtoenginetobethebestoftheDuramax

tothisday.Late 2007 broughta neweraindiesel,with

everstricteremissionsrequirementsleadingtotheintro-

ductionoftheDieselParticulateFiltrationexhaustsystems

andtheLMM.WhiletheLMMengineitselfwasverysimilar

totheLBZ,it wasstrappeddownwithanevenlargerEGR

systemandtheallnewDPFsystem,whichwouldtrapsoot

andburnit offinthefiltereverycouplehundredmiles.The

LMMhaditsproblems(mostofwhichrevolvedaroundthat

emissionsequipment),soin 2011 GMreleasedanallnew

platformcalledtheLML,whichcamewiththeintroduc-

tionofUreainjectiontotheexhaustsystemtohelpfurther

reduceemissions.TheLMLwasuseduntil 2016 withmuch

success,thoughsomeownersexperiencedCP4injection

pumpissuesandUreasystemproblems.

So,in2017,whenthenewsgotoutthatGMwasreleasing

a completely,from-the-ground-up,brand-newDuramax

engine,themarketwasecstatic.DubbedtheL5P,the

PEPITUP

MBRPoffersthisfilter-back,stainless-steelexhaustsystemforthe

L5PDuramaxthatwillreplacethatfactorytrumpettailpipewitha

unique,dual-exit,single-sidetip,allowingforanaggressivelookstaring

downthebarreloftwo,5-inchpolishedtips.

Installationofthefilter-backkitsis rathersimplebutwillrequireremovingthefactorysensorsfromthe

tailpipesectiontobereinstalledinthenewMBRPsystem.Onthe2017+GMtruck,thefactoryexhaustwill

needtobecutjustbehindthefilterwherethenewkitwillslipoverandclampintoplace.

downthebarreloftwo,5-inchpolishedtips.

TECH SIMPLE BOLT-ONS FOR THE L5P DURAMAX

40 OCTOBER I 2019 • DIESEL WORLD http://www.dieselworldmag.com