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Love the ideas... People have pretty much nailed it...
Wheels/tires
Header back, and a ti single for most weight savings. Battery. Aluminum Sumitomo (300zx/subie 4pots), battery, (probably the easiest,) spare removal if you have roadside, haha. FLYWHEEL/CLUTCH! (makes the car "feel" soooo much lighter, hard to quantify, may not be faster, but way more fun.) Driveshaft, pulleys. Suspension components- coils are light. Not sure about control arms etc, but any unsprung weight that can be removed will make a difference from a drivers POV. If you did that stuff bit by bit, all said and done, it would be an extremely nimble car, I own a Miata, and only imagine that responsiveness In the FRS chassis. If you are moving to body weight, focus on weight uo high, (not like there is any... CF roof saved like 2lbs I think) and at front/back extremes. You could do carbon doors, hood, fenders, trunk, but it'd cost a fortune, and you should be rocking a cage at that point, which would negate and weight savings. I say buy an NC Miata, strip it, moto east oem 2.5/cam swap it (210whp reliably attainable) remove airbags/top, cage it, light seats, center mount display, no radio, no A/C. Car couldn't be more than 2250, maybe less at that point with 200+ n/a Hp... Glorious.
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