For Sale: 1998 BMW Z3 in Christiansburg, Virginia

The 1998 BMW Z3 M Roadster modified by Dinan Cars is a highly sought-after, analog modern classic sports car that combines raw factory performance with period-correct, 50-state emissions-legal aftermarket tuning. In 1998, North American Z3 M models were equipped with the 3.2-liter S52 inline-six engine from the E36 M3, outputting 240 horsepower in stock form. Dinan upgrades elevate this platform with tiered performance packages---ranging from simple software tunes to forced induction---offering razor-sharp handling and distinct styling.Key Performance Modifications- Engine Software: Dinan Performance Engine Software safely alters fuel mixtures, optimizes ignition timing, deletes the top speed governor, and raises the rev limit by 200 RPM.- Naturally Aspirated Bolt-ons: "Stage 3" or "Stage 4" packages bundle the software with a high-flow cold air intake and an enlarged throttle body, yielding maximum gains of up to +31 to +38 horsepower.- For extreme performance, Dinan offered a centrifugal supercharger kit featuring fully recalibrated engine management, pushing the S52 engine to 340 horsepower and 307 lb-ft of torque.- Chassis Rigidity: A prominent, brushed aluminum Dinan Front Strut Tower Brace is commonly installed to reduce chassis flex and improve steering precision in the corners.Market and Valuation Factors- The "Dinan Point" System: Dinan historically used a points-based system for parts validation. Vehicles that accumulated enough points earned a coveted, serialized trunk badge, significantly raising their premium on enthusiast auction platforms.- Emissions Compliance: A primary benefit of a Dinan-modified Z3 M over other tuned equivalents is that nearly all period Dinan parts carry California Air Resources Board (CARB) Executive Orders, making them 50-state emissions legal.- Submodel Varieties: While the vast majority of 1998 M models were soft-top Roadsters, 1998 also marked the global debut of the ultra-rare "clown shoe" Z3 M Coupe, making a Dinan-built M Coupe an exceptionally scarce collector's piece.