Optimize the cage for stiffness.
Depending on where I would like the weight to balance the car, I would look at what I could legally replace/add/change.

For example, a heavier exhaust puts the weight really low.
Sturdier hardware for mounting the seat.
A heavier battery for that light right rear corner.
Ballast.
Gas.
Heavier gauge bulkhead for dividing the driver's compartment from fuel hose.
Sound/heat insulation like carpet, etc




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Ony Anglade
ITA Miata
Sugar Hill, GA