Sounds like you already have a great list. Your getting rid of the heavy OEM stuff and lightweight aftermarket will make the car better. Look at APR performance for your aerodynamics. Light weight rotors, seats, kmember, rims etc
If you can even find seats you be lucky. I asked forg if I could retrofit 15-17 recaro seats and said it was made for 15-17 airbags. I bet it’s possible but I’m not willing to try.
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