The air box is for the Disesl LC. Fabrication by Torfab. They've got 2 versions this one is a straight tube connection, their LS Swap is aluminum and the intake tube comes in at a 45 degree. Uses a flat panel that can be bought at the local store. Has 2 small brackets on sides to secure. The upstream side comes with 6"x12" rectangle inlet, came with blanking plate that you can fab a snorkel to. Pretty versatile. If you've got heat soak issue don't buy the diesel box I'm having issues shedding heat on short terms. However I'm plumbed in to drivers side mount, which I may switch it at some point. I used a 5 layer silicone/fiberglass Matt cut to size and created a diaper for it. I've found that it'll hold off convection much longer but wants the heat soak is in the box, then this works against you shedding it. Not a perfect answer other than it's been a journey. The black wrap over the MAF is actually a fiberglass starter cover with shiny on it. Huge huge relief of temps hitting the ambient on IAT 1 sensor. On a 80 degree day may be 10 over ambient, without it it can be 20-25 over.
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