The SARD MC8-R is the SW20 you've never heard of

The Sard MC8-R was a modified and lengthened version of the SW20 built for GT racing by Toyota’s works team SARD (Sigma Advanced Research Development).

The MC8-R housed a twin-turbo version of the 4.0-liter Toyota 1UZ-FE V8 producing 600 bhp (450 kW). Eligible for the GT1 category, the MC8-R lacked pace against the new generation sports cars and homologation specials such as Porsche 911 GT1, but did compete alongside a similarly modified Toyota Supra.

One MC8 road car was built in order to meet homologation requirements. The car disappeared from public eye within a year of its construction, but surfaced again on the Japanese collector car website SEiyaa in 2015, two decades after its disappearance.

The car is assumed to be in the possession of a private collector, as the vehicle’s sales listing has since been removed from SEiyaa.