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Driving into water - Are you covered by insurance for damage. Rufford
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Bit of a delayed response...
Not just the exhaust but all the gas in the exhaust/manifold and engine. Yes the lower section will cool rapidly but the engine/manifold
will take a little longer to cool. Just think of all those catalytic converters and DPF's going from hundreds of degrees celcius to tepid water
temperatures or lower in an instant. Used CAT / DPF only thermal shocked x times...