I'm savin up for a berlinetta v6 (86 or 87, i forget). Its got a flowmaster 70 series, sounds like a loud v6 now. Other than that, it's stock.
Both rears a bald, about an inch of tread on the sides is all that remains. So it smokes both tires, rather easily in their current condition, but it had to start spinning both to wear both down.
Was a posi an option? Sometimes if you just throw it in gear & go, it forgets its got 2 tires, but if you give it a quick left turn & straighten it out both are going.

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running for firestone customer of the year