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370Z is a GT car, so it has power and can do corners occasionally. But in stock form, it won't go pass 6 back-to-back hot laps on a tight Auto-X. The weight of the car is too much for tires and brake pads in stock form. Even upgraded tires and brakes will wear so much you won't get much use out of them. 370Z is best suited for high speed tracks, not multiple tight corners.
FT-86 will benefit greatly from the ~600lb or so weight reduction. The car doesn't have to exercise too much braking for tight corners. Granted, it will be slower when you hit the gas paddle. But this is basically a Miata NC with roof, back seat, extra 200LB and +30 HP. Bump up the Miata NC with roll cage, extra person and a higher RPM or 2 liter SkyActiv G engine, this is what you get.
Genesis coupe 2.0T makes more power than any another NA 2.0L FR coupe. But when a Miata whip a bunch of other cars around Auto-X, you can see that tight corners demand more than just power to weight ratio and firm suspension. If you don't brake or accelerate correctly, the car won't be able to put all the power to the ground. In FR cars, power delivery is important to prevent loss of traction in mid corner. Sudden torque boost during cornering will make the car lose traction during a corner.
As for price, imagine this. A 370Z will cost you $1000+ for a set of decent tires, installed. For FT-86, with 215/16, you're looking at less than $500 installed and they will last longer on spirited driving, due to weight and ability to switch the tires front to back.
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