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I had that exact issue on my DD. Couldn't figure out why my truck was missing and then noticed that three of my boots were melted and the plugs were shorting out on the headers. The PO put on normal wires and didn't protect them at all. Now I run Accel Extreme 9000 ceramic wires. They were pricey ($117 @ Jegs), but work great!
Thanks for the feedback guys, I picked up some of those sleeves, and also bought some Accel shorty plugs. Looks like I should have enough clearance now to be okay.