Why Wrap Exhaust
Side benefits are: keeps heat off the rider, lowers temp around the engine especially in stop and go traffic where the airflow is lowered.
You want around a 1/4 inch overlap and spray it will the silicon stuff you'll want to impregnate it pretty good. This will help it resist water, road grime and keep them lasting a it longer and keeps them from getting ratty looking.
I prefer the silicon spray with the black dye in there which helps cover up dirt etc.
Some say the wrap will eventually rot your pipes but I've found there are mitigating factors. First off you should completely ignore the instructions that come with the wrap. It's water getting in between the wrap and the pipe that causes the problems so you want to do everything you can to prevent that. First off remember this wrap wasn't originally intended for motorcycles. It's for the header pipes on cage motors or more-so hot rods. But the header pipes on automobile engines are much thicker than the thin walled pipes on our bikes so with cars, especially if the wrap in under a hood, water corrosion isnt much of an issue.
The instructions that comes with the wrap for motorcycles usually says to wet (or soak) the wrap in water prior to installation. Dont do that! Why introduce water into a situation where water is the biggest problem? Also, the instructions will say to wrap from the header down toward the exhaust end. Dont do that either! Doing that leaves the leading edge of the wrap exposed to the relative wind (the wind you ride through at speed) and this may eventually cause the leading edge of the wrap to begin unraveling. So wrap from the exhaust end up toward the header. Now the exposed leading edge becomes a protected trailing edge.
No matter which wrap you buy they all discolor over time. The blacks wraps will lighten and the grey, white, and tan wraps will darken. They do sell high temperature wrap paint but its spendy. However, your local hardware store sells Rust-Olium high temperature barbecue paint that works just as well at half the cost. The paint also provides some measure of water intrusion protection. I re-shoot my pipes once a year for looks and protection. And this wrap can soak up lots of paint so a half dozen coats isn't too many.
The way to really get a tight dry wrap is to remove the pipes and secure them down on a workbench (its tempting to wrap the pipes installed, but youll never get an even all around wrap.) Next dont use the wire ties that come with some wraps. Use regular size hose clamps. If you paint them to match the wrap and hide the screw mechanism behind the pipes they look fine.
Lastly consider the climate you live in. If you ride where its dry pipe corrosion isnt much of an issue. But if its very humid and/or it rains a lot then the under the wrap corrosion issues are much greater and you must take stronger measures to keep the water out.
Well, that about wraps it up, lol.
If you decide to wrap, follow NickD's advice. I have seen wrapped pipes that corrode the pipe in one season and will eventually corrode all the way through the thin wall of most head pipes.
So, it boils down to what look you want. Performance Coatings ceramic coated the Rinehart TDs on my 104" '02 FLHT.
http://www.performancecoatings.com/index2.html
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