I also went with the airaid MIT,Magnaflow 12259 and no resonator.i just cut it off and added a new tailpipe with a black tip.the Yukon goes from a slight rumble to a roar.next will be a tune.
If you don't have a yellow gas cap don't use e-85.your motor isn't set up to use it. I have a 07 Yukon flex and I use only 89/91 non ethanol.your Yukon will run better if you use at least 89 octane and non ethanol if you can find it.
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