sentences:  Differently from the European series, GT3 Brasil accepts professional drivers, in a system where drivers are graded from A (International Driver) to D (Fully Amateur), however, at least one of the drivers in each car must be of amateur status (C or D), except if a team is composed of two B-graded drivers, in that case, the car gets a 60 kg ballast penalty.Various other championships are also running now which allow GT3-spec cars to participate, notably British GT Championship, FFSA GT Championship, Belcar, Super GT and Super Taikyu.In 2007 the SRO and FIA have launched a similar championship, known as the GT4 European Cup, which features the same concept of using serial production sports cars, but with smaller engine sizes, minimum modifications and restrictions on the professionalism of participating drivers.