I intend on using my rolls of aluminum flashing to cover the exhaust portion under my car...won't have to worry about it melting.
Raising the exhaust would probably be a PIA, and might rattle against the under body when the engine is under load or using the engine to brake, but could theoretically be done. A flatter - probably wider - muffler could potentially be substituted. The muffler probably won't get hot enough to melt the chloroplast, if you're not doing long trips...but at some point you probably would want to and then it would go on you.
I've seen nice, neat trimming done around the muffler, keeping it maybe 1/2" from touching it...air would flow over the muffler quite smoothly with that, assuming it's relatively smooth.
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