A 2012 Cadillac CTS-V wagon with 700 horsepower at the wheels just hit Bring a Trailer, and it’s the kind of car that makes you wonder why GM ever stopped building longroof monsters. The auction ends July 15, and someone is about to get very lucky or very sideways.

The CTS-V wagon was already an absurd proposition from the factory. Cadillac dropped a supercharged 6.2-liter V-8 making 556 horsepower into a station wagon and dared buyers to keep a straight face at school drop-off. Car and Driver once compared it to the Bugatti Veyron — not in price or speed, but in sheer senselessness. Both made no sense. Both were awesome.

This particular car takes that factory absurdity and stomps on the accelerator.

The modifications read like a manifesto. Ported heads, upgraded camshafts, new headers, a carbon fiber air intake, bigger fuel injectors, a beefed-up heat exchanger, and improved cooling throughout. The formula is old-school hot rodding applied with surgical precision: more air, more fuel, bigger bang. The result is roughly 700 horsepower sent to the rear wheels through a six-speed automatic and a limited-slip differential that deserves hazard pay.

To keep all that fury pointed forward, somebody fitted a Canepa Design widebody kit — the same Canepa that’s been modifying exotics and race cars for decades. Out back sit 345/30 Michelin Pilot Super Sports on 20-inch wheels, with 285/40 Super Sports on 19-inch rims up front. Coilover suspension replaces the factory setup, and Brembo brakes handle the stops. This isn’t a garage queen with bolt-ons and prayers.

The original CTS-V wagon already out-handled its German rivals. In period testing, it drove with more composure than the contemporary Mercedes-AMG E63 wagon while carrying the same suburban-missile DNA. Adding 144 horsepower and proper rubber doesn’t change that character — it amplifies it.

Cadillac built roughly 2,000 CTS-V wagons across the second generation’s entire production run. They were rare when new, and the market has noticed. Clean examples routinely trade north of six figures. A modified car always carries risk at auction, but the spec sheet on this one suggests someone who knew exactly what they were doing.

The deeper irony is that GM teased a V-wagon with the first-generation CTS-V and chickened out. It took until 2011 to actually build one, and by 2014 the wagon was dead. Cadillac’s current CT5-V Blackwing is a brilliant sedan, but there’s no wagon version, no estate, no longroof. BMW still sells the M5 Touring in Europe, Mercedes still offers AMG wagons, and Cadillac walked away from the segment it briefly owned.

Cars like this blue bomber exist because the factory left room on the table and owners picked up the check. Seven hundred horsepower in a station wagon with a Canepa widebody kit is not rational transportation. It is, however, exactly the kind of machine that reminds you American performance cars don’t have to be two-door coupes or jacked-up trucks.

The bidding window closes July 15. Somewhere in a quiet suburb, a garage is about to get a lot louder.