Porsche launches 911 GT3 RS 4.0

• Four-litre engine for 911
• Now with 493bhp
• On sale July from £128,466

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Does your Porsche 911 GT3 RS not quite cut the mustard? Fear not because Porsche is launching the special-edition GT3 RS 4.0.

Limited to just 600 cars worldwide, the GT3 RS 4.0 replaces the sold-out GT3 RS and comes with a 4.0-litre six-cylinder engine from the GT3 RSR racing car.

While the 'standard' GT3 RS was powered by a 444bhp 3.8-litre, engine the GT3 RS 4.0 has 493bhp. A manual six-speed sports gearbox helps the car from standstill to 62mph in just 3.9 seconds – a tenth of a second faster than the GT3 RS. Top speed remains unchanged at 193mph.

The suspension set-up has been revised and further aerodynamic tweaks make the car even more suited to the racetrack.

Emphasising that the GT3 RS 4.0 is no Sunday-afternoon tourer, the interior looks like a race car's, with carbonfibre detailing, a half roll-cage, seatbelt harnesses, a fire extinguisher and a battery cut-off switch.

The car comes only in 'Carrara White.' This is not a spelling mistake and has nothing to do with Carrera. Carrara is a type of marble from Italy.

All this comes at a price – the GT3 RS 4.0 will cost from £128,466 when it goes on sale in July – almost £20,000 more than the car it replaces.