This 1997 BMW M3 is a silver-over-gray sedan that was acquired by the seller’s brother in 2003, and it has remained in the family since and now has under 132k miles. It is powered by a 3.2-liter inline-six paired with a five-speed manual transmission and a limited-slip differential. Equipment includes 17″ M Contour wheels, the Luxury Package, and power-adjustable and heated sports seats, while modifications include an aFe Power air intake, an S50-specification intake manifold, aftermarket engine…