Porsche GT3 RS is powered by a 3.8 liter flat-six engine with 450 PS (331 kW). 0 to 100 km/h takes 3.6 seconds, to 200 km/h (124 mph) in 13.3 seconds and top speed of 310 km/h (193 mph).

It stands on 9J x 19" rims fitted with 245/35 ZR 19 sports tires at the front and 12J x 19" wheels incorporating 325/30 ZR 19 sports tires at the rear.

It is priced at 122 400 EURO.

On the other hand, BMW M3 E92 GTS has a hi-revving 4.4 liter V8 with 450PS at 8300RPM and 475Nm (325 lb-ft) of torque at 3750RPM. 0 to 100 km/h in 4.4 seconds, and the top speed is 305 km/h (190 mph).

The engine is mated to a re-tuned 7-speed M Dual Clutch Transmission with Drivelogic. M3 GTS also has a revised suspension, rollcage and serious weight reducing. The total weight is 1530kg.

The price is £116 000, a bit higher than the Porsche.

Which is best? Check out the video!

Porsche 911 GT3 RS

2010 BMW M3 GTS, 1 of 5
2010 BMW M3 GTS, 2 of 5
2010 BMW M3 GTS, 3 of 5
2010 BMW M3 GTS, 4 of 5
2010 BMW M3 GTS, 5 of 5
Porsche 911 GT3 RS, 1 of 5
Porsche 911 GT3 RS, 2 of 5
Porsche 911 GT3 RS, 3 of 5
Porsche 911 GT3 RS, 4 of 5
Porsche 911 GT3 RS, 5 of 5

Source: BMW Blog via Youtube