Diesel World – October 2019

TECH SIMPLEBOLT-ONSFORTHEL5PDURAMAX

accustomedto.Tuningor‘chipping’anL5Pcomputeris a

bitofchallenge.It’spossible,butrightnowit’sextremely

expensiveandyoucankissthatwarrantygoodbye.

Also,if you’veeverdrivenanL5Pyoumaynoticetheslow

responsetothrottlepedalinput.Forwhateverreason,the

GMengineershavecreateda bitofa delayinwhathap-

penswithyourfootandsoontheenginereactstoit.Even

throughthetruckshavegobsofpowerontap,whenleav-

inga stoplightwitha heavyload,youmaynoticesome

hesitationfromthetruckbeforeyoureallystarttofeel

that.TheguysatEdgeProductshavebeenintheengine

tuninggamejustaboutaslongorlongerthananybody

andwantedtohelpthoseownersfedupwiththe‘dead

pedal’feeling.

TheAmp’dThrottleBoosteris theireasyfix,andjustabout

anyonecaninstallinlessthan 20 minuteswithnotools

required.Bestofall,it willcompletelyremovethatdead

pedalfeelingwithoutactuallytouchingthetruck’sECM

oraffectingyourfactorywarranty.TheAmp’dmodule

justadjuststhevehiclespedalpositionsensortobetter

controlenginefuelingbyremappingthethrottlepedal

range.You’llhavetheoptionofthreedifferentsensitivity

levelssotheenginewillreactsoonertothrottleinputand

getyouintothepowercurvesooner.So,whileit won’tin-

creasehorsepower,you’llgettousewhatpoweryouhave

whenyouaskforit—notwhenGM’sengineersthought

you’dwantit.

Now,ontoanotherissue:theeyesoreGMcallsa tailpipe.

Whiletheventedtipis a necessityontheseemissions-

equippedtrucks,whyshouldyoubeforcedtodrivearound

witha trumpetstickingoutfromundertherearbumper?

Sure,wetotallyunderstandwhytheexhaustoutletneeds

tobecooledbytheoutsideambientairbeforeit actually

exitstheexhaustsystem,butyouknewtheaftermarket

wouldhavesomebetter-lookingoptionsfortheL5P,and

thesingle-sideexit,dual-5-inch-tipfromMBRPwasjust

theticketforthis 2017 Denali.

MBRP’sProSeriesexhaustis constructedofT304stain-

lesssteelforyearsofdurabilityandstylishlooks.This

systemwilloutlastthefactoryexhaustwhilebeingeasy

tocleanandkeeplookingniceeveninwinterclimates.

OntheL5Ptrucks,theDPF-Backsystemis simpleto

install,withthetoughestpartofthejobbeingcuttingthe

factorysystemjustbehindtheDPFsothenewtailpipe

canbeslidonandclampedintoplace.Everythingfitlike

factoryandlinedupperfectlywiththefactoryhangersand

exhaustsensors.Thisparticularkitincludedtwo5-inch,

polishedstainlesstipsthatwillmountside-by-sideunder

thepassengerrearfender.Withtheventedoutletpipe,

theexhaustexittemperaturesarestillreducedtoa safe

range,andthepolishedtipslookincredibleinplaceofthe

factory5-inchtrumpet.

Onthisparticulartruck,whichis usedprimarilyfortowing

a large,38-ftRVfifthwheelthroughthewesternmoun-

tains,thequickerthrottleresponseintheAmp’dmodule

helpsgetintothattorquebandsooner,makingpassing

onthefreewaya breezeandleavinga stopsignloadeda

littlemoreresponsive.WhiletheMBRPsystemwasdone

moreforcosmeticreasonsthananythingelse,it is notable

thatthenewtipplacementworkedoutbetterwiththe

hitch-mountedmudflapstheownerrunswhiletowing,

sincethefactorytailpipewasdumpingatthebumper

andhadactuallyburnedthroughtherightrearflap.The

dual5-inchexitdoesreallyimprovethelookandstance

ofthetruck,goingwellwiththeotherchromestyling

cuesonthisDenali.Thebestparttothesepartsthough?

Everythingwasinstalledinlessthananhour—ina home

garage—withnothingmorethanbasichandtoolsanda

Sawzall.Howcanyoubeatit?

PEPITUP

SOURCE

MBRP INC

MBRP.COM

EDGE PRODUCTS

EDGEPRODUCTS.COM

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