PORSCHE fanatics, it’s time to sell everything you own. One of the rarest and most collectable air-cooled 911s is going to auction next month with just 10km on the clock.

This Porsche 911 (964) Carrera RSR 3.8 was special ordered new in 1993 and is one of 51 ever made, and one of just two to be fitted with a fully trimmed interior.

Sitting in its rump is a race-ready, dry-sumped, naturally aspirated flat six with outputs conservatively listed at 260kW and 360Nm. The truth is considered to be somewhat higher than that.

How any Porsche obsessive could allow a car like this to sit dormant for 24 years is hard to imagine, but it has the potential to set auction records when it goes under the hammer on May 27.

Examples of these RSRs that did make it to starting grids won races all over the world, including 24 hour enduros at Spa, Daytona and Interlagos, and the Suzuka 1000km.