Exhaust System Insulation

Prep
The wrap is too stiff for applying when dry, so dampen it in a shallow pan or dish before you start wrapping. Don't soak it, though. Just a quick dip is enough.


Start by wrapping your first length around a header tube at the flange. Use a snap wrap or hose clamp to secure it. Snap straps are handy in tight locations where a hose clamp would be in the way of spark plugs or header bolts, but hose clamps are easier to install. As you wrap the tube in a spiral fashion, overlap the layers by a quarter-inch and pull tight.

Finish
Snap-Strap, an ultra-thin stainless steel perforated metal strap, comes in a roll and is cut to length. Wrap the strap around the tube, slip the two ends of the strap through the barbed bracket and pull it tight. A small pair of needle-nose pliers is handy for twisting the ends back (like opening a sardine can).


Wrap each primary tube down to the collector, secure the bottom end with a strap or clamp, and then wrap the collector. The tricky part is getting the wrap into the tight crevices between the tubes. If necessary, use a screwdriver to carefully pry the tubes apart. The objective is to cover all metal areas with wrap, right down to the outlet flange. Dry the wrap out by putting the headers out in the hot sun, or use a hot lamp to help cure. As it dries the wrap becomes harder. Once dry, spray with Hi-Heat paint, which seals the pores and protects from moisture.