Powertrain changes included the removal of the top speed limiter and a shorter differential ratio (3.23 compared to 3.15). Suspension upgrades consisted of shorter springs from the European-specification M3. Before being sold, the M3 Lightweights were sent to Prototype Technology Group Racing in Virginia for final preparation, which included the front and rear Motorsport flag decals, and "trunk kit". In the boot there was a dual-pickup oil pump (from the European-specification M3), front strut bar, lower cross-brace, spacer blocks to raise the rear wing, and an adjustable front splitter. Each owner was given a 1-page legal document to sign acknowledging that any installation of boot items voided the new car warranty.