The 2014 Porsche 911 GT3 is hailed as one of the fastest and most capable sports cars on the market. Now Porsche is already working on the next-generation 911 GT3 RS… our fotogs caught it being testing under minimal camouflage.In February 2014 Wheels24 reported that Porsche had recalled 758 units of its 911 GT3 because two had caught fire in Europe. Then,, in March, the automaker said it would replace all engines. Let's hope the RS version doesn't have similar problems. GALLERY: 2015 Porsche 911 GTS RS (Spy)The RS prototype features a wider track than the standard 991-generation 911 GT3 and features a huge rear wing. However, we doubt the exact rear wing will make it on to the production car. This 2015 Porsche 911 GT3 RS prototype sports a larger front splitter. The automaker says with these aerodynamic improvements, downforce of the new GT3 RS could be up to around 50% when compared to the ‘regular’ 991 GT3.Under the bonnet, the new GT3 RS will see a slight power increase compared to the standard car, pushing the total figure towards the 373kW figure. Porsche says the new model will have different gear ratios and should be able to sprint to 100km/h in around 3.5 seconds. Top speed will be slightly decreased due to the increased downforce. But the best news is that the new GT3 RS could be available with a manual transmission.More spy shot action -click here.