Hey Tom, have you looked into a Solstice GXP or a Saturn Sky Redline? The naturally aspirated versions of these have been dominating autocross. Very nice stiff chassis and suspension. And 250+ HP (probably underrated) and 2900 lbs means fun. And they're damn cheap, or will be once the hype dies down and the dealers stop adding their market adjustments.

Though it seems you are interested in a coupe, not convertible.

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1985 CA 300D Turbo , 213K mi