When we last visited Dinan to test its supercharged M5, we noticed a black M3 sitting in one of the workshop bays with an experimental supercharger installation attached to its motor. It was not until nearly a year later that Dinan declared the S3-M3 engine project officially 49-state emissions legal and ready to roll, with California emissions certification just around the corner. The complete car with engine, chassis, and wheel and tire modifications is known as the Dinan S3-R M3.
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