Is the Buick GNX bubble about to burst?

Only 547 1987 Buick GNXs were ever built.

Only 547 1987 Buick GNXs were ever built. (Bring A Trailer)

Auction prices for the rare 1987 muscle cars have reached staggering heights this year, with several selling for over $200,000, including one that went for a record $275,000 in June.

Every 1987 Buick GNX is black.

Every 1987 Buick GNX is black. (Bring A Trailer)

Just last week an example with 759 miles on the odometer was sold on the Bring A Trailer website for $236,000, but a more recent sale suggests a ceiling may have been reached.

The 1987 Buick GNX is powered by a turbocharged 3.8-liter V6 with over 300 hp.

The 1987 Buick GNX is powered by a turbocharged 3.8-liter V6 with over 300 hp. (Bring A Trailer)

A 936-mile example of the turbocharged V6-powered coupe was auctioned on the website on Monday for $215,000. That still ties it for third-highest price ever with a car that has 1,200 miles on it, but only two bids were placed early in its week-long listing and there was no last-minute frenzy as the deadline approached, as has been the case with recent offerings.

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Only 547 GNXs were built during its single model year, when it was the quickest-accelerating American car on sale.