The stunning Grand Prix circuit at Brands Hatch is the setting for rounds five and six of the Porsche Carrera Cup GB this weekend (1/2 May), with a capacity 28-car field set to do battle around the famous track.Coming straight after rounds three and four at Rockingham, the attraction of racing on the superb Grand Prix circuit at the Kent track should draw a record grid for the Carrera Cup, with a 28-car field set to top the previous record of 27 911GT3 Cup cars.With four wins from four races so far, Tim Harvey (Red Line Racing) has seized the early advantage during a stunning run of winning form, but Michael Caine (Motorbase Performance) has taken the fight to Harvey every time out and is determined to stop Harvey winning again at Brands. In the two Rockingham races, less than a second split Harvey and Caine after nearly half an hour of racing and Caine knows that he has the pace to beat Harvey, particularly if he can qualify on pole position. Heading for Brands, Harvey has a 12-point lead over Caine, but one non-finish will have a big impact on the early title race.However, this is far from a two-man contest as a gaggle of quick young racers are shaping up to challenge Harvey and Caine as the season develops. Notable contenders are the three drivers from Team Parker Racing, Euan Hankey, Glynn Geddie and Stephen Jelley. Hankey has claimed three podium finishes from four races, while Geddie took a big step forward in round four at Rockingham to bag his first podium of the season as Jelley chased him home. Other challengers in the pro category include Tom Bradshaw (JHR), Charlie Bateman (Motorbase Performance) and Michael Meadows (Red Line Racing).In the pro-am1 category, Ollie Jackson (Addison Lee Motorbase) has made a superb start to the season with three wins from four races, but he faces a gaggle of contenders, topped by Tony Gilham (Collins ReDesign Racing), who will be racing on his home track. Newcomers Jonas Gelzinis (Juta Racing) and Ahmad Al Harthy and Archie Hamilton from Red Line Racing all add to the depth of quality in pro-am1. Once again, Gelzinis will have to learn the track during Friday's two test sessions, but his pace over the early races shows that the 22-year old Lithuanian is a fast learner.Meanwhile, in pro-am2, the top four drivers are proving very evenly matched. Mark Hazell (JHR) and Glenn McMenamin (Red Line Racing) have both won the category this season, while Steve Parish (Addison Lee Motorbase) is moving ever closer to the top of the podium. Arriving at Brands, Hazell has a single-point lead over Parish in the points' table, with McMenamin chasing hard after a classy victory in round four at Rockingham. George Brewster (Celtic Speed) is right there too, while teenager George Richardson (Motorbase Performance) is getting quicker with every race.Carrera Cup qualifying is on Saturday at 11.55, with the first race at 10.10 on Sunday and the second race at 16.05. The second race is due to be shown live on ITV4 in the extensive BTCC race day programme, which starts at 11.30am.