What Are You Doing/Have You Done To Shed Weight?

One starts with placing iron with aluminum where applicable. Start with heads/intake. Then get rid of heating components. Core and motor. Wipers and motor. Replace battery with olm or even new lithium options. Car then is like a motorcycle. Only nice weather vehicle. Brakes. Lighter weight disc brakes with aluminum master cylinder. Steel rims certainly have to go. I would not look at drivetrain components. Rotating weight is different. And "lighter" doesn't necessarily mean faster there. Fiberglass bumpers. Front clip, doors and trunk deck if available. Glass. Replace side and rear with Lexan. (Windshield might be illegal in your state for street use.)

All of these changes at once would probably be for race only. But each are available for your consideration.