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  1. T

    2008 Yukon Denali, 135k miles, part 2!!

    Got em. Damn beefy. I'll have to carve out some time next week to install.
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    2008 Yukon Denali, 135k miles, part 2!!

    I saw those posts about the hummer mounts. Those might transmit a little less vibrations than what I'm getting. I'll post when these are installed.
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    2008 Yukon Denali, 135k miles, part 2!!

    First, why aren't my forum hosted pictures showing? I guess I'll stick to imgur. Second, the drivers header O2 is still hitting when accelerating. I did research and see that GMT900 trucks have TONS of issues with the stock motor mounts. They're fluid filled and while they work well to stop...
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    2008 Yukon Denali, 135k miles, part 2!!

    It took 6 hours but I finally got my cat & muffler in. I have a couple very small leaks that I'll work on later. They're minor. Too lazy for jack stands today. Out! I had to cut the pipe right before the muffler to get it all out. Muffler comparison. It was installed the other direction...
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    2008 Yukon Denali, 135k miles, part 2!!

    I wonder if they would affect the O2 readings?
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    2008 Yukon Denali, 135k miles, part 2!!

    Is anyone slower than I am?? I got the final parts. 4'' & 6'' flex pipes and 3x vband clamps. Surely I have enough parts and options? I'll take a whack at it tomorrow.
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    3.5 inch cat back $130 dollars.

    Old thread I know. I just got this muffler. Thanks for your info here. Now to figure out how I want to install it....
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    2008 Yukon Denali, 135k miles, part 2!!

    12909 Magnaflow muffler arrived.
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    2008 Yukon Denali, 135k miles, part 2!!

    3.5'' pipe is hard to find locally. Most is 3'' or less. 3.5'' is HUGE, I should know..... :-/ I have a magnaflow muffler arriving then I can weld in the cat.
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    2007 Yukon Denali Build (This got outta hand really quick...)

    Magnaflow #12909 ;-) Got it! Sounds good. My headers through the stock muffler sound like ass. Too raspy and like a pissed of race car.
  11. T

    2007 Yukon Denali Build (This got outta hand really quick...)

    One last thing. What model magnaflow did you get and does it drone?
  12. T

    2007 Yukon Denali Build (This got outta hand really quick...)

    Thats too bad. I have non-catted headers/ypipe and was considering them. Perhaps I'll stick with my plans for a single vibrant cat after the ypipe. I've read they're more resistant to damage. Great work BTW!
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    2007 Yukon Denali Build (This got outta hand really quick...)

    Cats were torched? They look ok in the pics. What happened?
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    2008 Yukon Denali, 135k miles, part 2!!

    The TSP 1.2 VVT is 223/233, .629"/.629", 114 LSA You think this cam would need a stall?
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    2008 Yukon Denali, 135k miles, part 2!!

    What cam did you go with?
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    2008 Yukon Denali, 135k miles, part 2!!

    I have misc exhaust parts and connectors on order to finish the cat install. I decided I'm not using a flex join. There isn't any room. Poking about the stock exhaust, the hangers offer plenty of movement for installation without a flex pipe. I'll hopefully have my wideband in hand next week...
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    2003 yukon denali build

    Cover the scratch with a tasteful autozone stick on hood scoop.
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    My Resto-Mod Odyssey - '08 Tahoe LT3

    "So I've heard" VA doesnt do a sniffer test. They pull obd2 codes only. If someone perhaps has HPTuners, they might just tune their truck to report all is ok with their cats. I heard a guy named tgui possibly knew a guy that had a highly modded STi with a single high flow cat and tuned out the...
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    My Resto-Mod Odyssey - '08 Tahoe LT3

    My mother in law's comment about my long tubes and stock exhaust was concern that my Yukon must be broken in some way. There are hypocritical liberals like me with loud exhaust and no cats ;)
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    2008 Yukon Denali, 135k miles, part 2!!

    Hard to get a picture of but this is what I have to work with. I'll probably cut it out just before the muffler, enough to get a slip joint on. Then I'll cut off the flex joint and replace with the cat and a much smaller flex joint. Stock flex joint is 10 inches, new cat is 7.5 inches.
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    2008 Yukon Denali, 135k miles, part 2!!

    Not yet though last night I had time to get measurements and pics of the stock exhaust piping before the muffler. I'll be looking for flex joints and piping now. It was more important to get my hornsx6 working.
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    2008 Yukon Denali, 135k miles, part 2!!

    My horns were going in and out. Today totally out. Lets look at the relay. Hmmmmm Enhance Enhance Enhance again...
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    2007 GMC Denali stalls after towing

    Maybe I'm just a pussy. ;) All my fast cars/trucks have had at least high-flow cats. Yeah E85 is a totally different beast too. My STi friends would run that. I never did, but probably should have tried it! I was doing 24psi, 15.5 degrees at peak torque on regular 93 so was pretty happy.
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    2007 GMC Denali stalls after towing

    Nah, that sensor doesn't do much at all.
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    2007 GMC Denali stalls after towing

    You'll need to make sure its away from the cooler and in an area where it gets air flow. I had to move mine on my prev Yukon when I did a large trans cooler. Per the stalling issue, the fuel line runs by the trans and I think pretty close to the drivers exhaust. I'd see if it were possible to...

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