Performance Tests with Open Exhaust Cutout

9:35

33:13

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At 9:35 in

We Raced Our Sleeper Turbo 03' Yukon XL Against 1320 Kyle's 6.2L Denali! (Then He "Test Drove" It)

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What happens here

With the exhaust cutout removed, the Yukon is taken for several more drag race runs. The driver makes adjustments to the launch technique (more aggressive boosting) and tries different drive modes (4WD and 2WD) to see how the open exhaust impacts performance. The goal is to see if the reduction in exhaust back pressure translates to lower elapsed times and higher trap speeds.

Goal: Evaluate the performance improvement after removing the exhaust restriction.

Tools and materials

Drag Strip I-29 Dragway — Controlled environment for performance testing
GMC Yukon XL GMC — The vehicle undergoing performance testing

What they say

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also not super thrilled because it needs more friction modifier in it probably different viscosity fluid but we're just going to let it ride hear that but going well that felt way better [Music] that was good we're going to run again we're racing some people today yeah I think it trapped 80 that time maybe 81 I'm not exactly sure but I saw the speedometer was right at 80 at the end and it was significantly uh quicker launch gotb out there hell yeah yeah 80.5 but still a 2o 60 foot hm maybe I can load it up more that or the uh the gear ratio difference from the 4l60 really made that much of a difference even though it was half blown up which is very possible that and the rest of the exhaust which is like another 3T of pipe it's not a ton but may make some of a difference for 10 lbs of boost can't beat it this thing's a riot for 10 lb of boost we're racing Kyle's Yukon run you oh oh sweet we got a passenger it's okay we're not fast enough to need one of these D so that's what that looks like down there well the thing is when someone tried to steal my Duramax they stole this and took all my change so the one from Uncle Rob is now in my Duramax go yeah I know I need to go get a new one this takes me back to where my dad had one of these holy cows it's like the exact same thing just more power more power more power I used to sit back there when I was a little kid kick the seat I I tie a when we go on long drives I would tie a hockey jersey from this thingy to the back of the headrest and then shove a pillow in it and I'd sleep like that I go to Grandma's house in Michigan DN so many memories yeah and now we're racing it it's funny so your uncle ordered this like way back in the day right my dad did your dad did yeah my dad was the original owner he ordered it new uh he got it in July 2003 I got a picture of me sitting in his old 95 Suburban wearing a DNH heart jacket with this one brand new in the background go down suck it Kyle on that light boy I'm doing my best oh he's going around the water uhoh oh he thinks he's going to spin okay no chances we'll be taken man who backed into something uh I don't want to talk about it oh my God Kyle doing a burnout you're in trouble man hey yukong gets down is that thing two wheel drive no but he had he probably has in a two wheel okay [Music] [Applause] red we red lit but we GA anyway so I still gave him hazards Bo to the Ukon [Music] oh hit him with the hazards oh Kyle's talking on the walkie-talkie he is yeah tell him…

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