Quote:
Originally Posted by aerohead
Some racers will incorporate fiberglass tailpipe/muffler wrap and auxiliary heat shields if necessary,in order to completely cover the belly.
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AFAIK exhaust wrap also allows the catalyst to heat up sooner, decreasing the so-called "cold phase" which is where most of the harmful emissions are generated. Seems ideal for a hybrid, considering its engine would be operating in a more intermittent way in city driving. On a sidenote, besides protecting nearby components more sensible to heat, retaining more heat at the exhaust flow instead of allowing it to irradiate is often claimed to improve its flow.