We thought it is not possible to make the Jaguar XKR-S any better than it already is. We were wrong. It is.

And that’s by taking its roof off. According to AutoExpress, Jaguar is already working on a soft-top version of its ultimate GT to compliment the range. It is actually quite easy imagining the looks of the XKR-S Convertible, because we’re familiar with the XKR Convertible and the S should have the same sort of roof arrangement.

Thanks to the S body kit though, it’ll look twice as good as the XKR. Technically, the car will be identical to the XKR-S hardtop, which means it gets a 550 hp and revised chassis and suspension. But it’s top speed would be a bit lower than the hard top due to the limits of a fabric roof. It’ll be fine in ordinary speeds, but it’s not much cope with 180+ mph.

The sources are also talking about a hotter version of the XFR sedan, called the XFR-S. This super saloon will be like a four-door version of the XKR-S and it’s power output will make it a proper rival for the upcoming 2012 BMW M5.

In other Jag XKR-S news, the car has made a dramatic Scottish debut at the Race the Runway charity event organised by The Prince & Princess of Wales Hospice.

Held at Edinburgh Airport the event saw 32 cars compete in drag races along a 1,800-metre runway.  The XKR-S beat off fierce competition to make it to the semi-final, outpaced only by vehicles valued at over twice the XKR-S’ £97,000 price tag. From rest the 550 PS Jaguar hit 100 mph in just over eight seconds before being measured reaching a terminal speed of 165 mph.

Now in its third year, Race the Runway has so far raised over £40,000 for The Prince & Princess of Wales Hospice and other co-nominated charities.  This year’s event saw a record entry. Joining the XKR-S and the XKR in the line up of vehicles was an XFR, also making its Scottish debut.