A slipped timing belt has been shown to cause P0725 for a couple of other members here, usually caused by a bad timing belt tensioner or improper timing belt installation. The ECM is seeing conficting results when comparing the input of a speed sensor in the transmission against the angle of the crankshaft position sensor, which flags P0725. The whistle sound is residual pressure from the supercharger bleeding off right after shutdown. Mine does that a bit too.
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