The market is full of high-performance sports sedans, but muscle-wagons are a rarer breed. Audi's RS6 is available exclusively in Avant form, but BMW no longer makes an M5 Touring. Mercedes won't sell you an E63 AMG wagon, but it will a C63 wagon or CLS63 AMG Shooting Brake. Cadillac is discontinuing the CTS-V sportwagon, but Jaguar could plug the gap with an XFR Sportbrake. As you may be aware, the Jaguar XF is available in Sportbrake wagon form, but the XFR's 503-horsepower supercharged 5.0-liter V8 is not on the options list.

Speaking with Autocar, however, Jaguar director Adrian Hallmark had to admit that building an XFR Sportbrake could be an "interesting project". The difficulty, according to Hallmark, would be "to re-engineer the self-leveling rear suspension" fitted to the Sportbrake in order to handle the XFR's extra power. If Jag's engineers could figure it out, though, the company could build a limited run of 300-400 XFR Sportbrakes. We figure once they're already at it, why not skip straight to an XFR-S Sportbrake with the 542-horsepower engine?