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    I'm lost about exhaust

    Enough with the rhyming. Both catalytic converters went out on the 05 denali, so in contrary to the advice I received here I ordered what seemed to be a Magnaflow "Y" pipe for the Denali (link) It got here, and it won't fit because it has a manifold that conjoins the two tubes together before...
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    Bolt-on catalytic converters for 6.0?

    At 326,000 miles, the Denali needs two new cats (again). Last time my dad put aftermarket, thinking the car would die before then. It obviously hasn't, but we still want to save the money going aftermarket. Without blabbing on about all our woes, we do need to be able to do this cheaply. I...
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    Two evap codes 05 Denali

    A few weeks ago the check engine light came on with a P0420. I cleaned the throttle body, installed new plugs and wires, and it went away for a few hundred miles. Now it's back, this time with an additional code as well, P0455. While I had it apart, I noticed that the little evap thing on top...
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    OEM Lug nut covers (05 Denali 20")

    I lost one of my chrome lug nut covers on my 05 Denali. It has factory 20" chrome 6 spoke wheels. Should I order it from my local dealer? Amazon didn't turn up anything good.
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    Two very useful readings oil and oil filters

    I found these while on Amazon, and thought they were very interesting and full of a lot of very specific technical insight. Here's the one on oil changes, all of the best information has been edited into the first post by the thread creator. And this is the one on oil filters, which...
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    Changing out the oil cooler in 6.0?

    I have low oil pressure on the 05 Denali, which last week passed 300,000 miles. It's had it for a while, and the dealer said it wasn't the oil pump, and someone else checked to see if it was a plugged screen on a sensor, but it turns out the Vortec 6000's must not have those screens. After...
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    Dual color LED turn signals/marker lights?

    After load resistors not working properly when the marker lights were on and such, I found a better way to fix hyper-flashing: buy a new flasher designed to not care about voltage - link to it here (note that I think it's specific to 03+ GM trucks/yukons/etc.). I think I'll to a technical...
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    0-60 times? What are yours

    Just wondering how many people have clocked their Yukon's/Tahoe's 0-60 time. Post the time and the model/year/engine and any other relevant information.
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    Painting the GMC logo on an 05 Denali? Opinions?

    How should I paint the GMC logo on my '05 Denali? Semi-gloss spraypaint or get it professionally painted? I'm going to tape off the chrome lining on the logo, of course. Any recommendations from someone who has done it before?
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    2005 Yukon XL Denali

    My parents bought a Yukon XL Denali AWD new in 2005. We're now at 298,400 miles, and without too many hiccups. It's hauled way more than it ever should have (10,000lb trailers in the mountains), and survived my sister rear-ending someone. It had a re-manufactured transmission put in around...
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    2005 Yukon XL Denali LED turn signals

    I just installed LED bulbs in the turn signals on my parents 2005 Yukon XL Denali. Yes, I installed load resistors (10 Ohm/25w link). So here's the deal. The socket has three wires, because it is used for both a marker light and a turn signal. The bulbs have four pins. I wired the load...

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