In short: the 6cyl cars are notably faster than a Miata but the handling, while still good, isn't as responsive. The cabin is a more upscale and slightly roomier for tall people. Parts costs, insurance and labor rates are higher. Part for part, Z3 mods are generally more expensive than Miata mods, but the car responds well to them. The choice engine swaps are the 240hp and 330hp engines from the M Roadster/Coupe, but for the price and hassle you might as well just get an M to begin with.
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