Quote:
Originally Posted by tracer bullet
Wrapping the exhaust helps keep the outgoing gasses hotter and therefore less dens, making it easier for them to get the hell out of the way of the more recently created exhaust gasses being expelled right behind them. Anytime your exhaust cools in the pipe it starts to become more of a restriction. Restrictions are bad.
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The energy (temperature) difference pre/post turbine is what drives the turbo to work. Wrapping/coating the exhaust manifold would be beneficial, not so much the downpipe and rest of exhaust.