All four Porsche Carrera Cup GB titles will be settled during the final weekend of the season at Brands Hatch on 20/21 September, and for the overall crown it is now a straight battle between Tim Harvey and Michael Caine heading for rounds 19 and 20.After 18 races and over 400 racing laps, just seven points split Harvey (Red Line Racing) and Caine (Team Parker Racing) in what has been an enthralling battle for the 2008 crown. A sensational drive from Harvey in the last round at Silverstone has given him a seven-point lead, but both drivers know that, with 43 points on offer at Brands, it could go either way."I can go to Brands with no degree of comfort, but with a small advantage," said Harvey. "After the way this championship has gone for me in the past, I would absolutely say the chances are 50/50 between Michael and I. Anything could happen and we'll just go to Brands and do our best."Caine, meanwhile, knows that he ideally needs to finish ahead of Harvey in both races this weekend. "We'll be all right for Brands Hatch," said Caine. We won both races there at the start of the season and there are a lot of laps to do yet."Of course, there are more than two drivers in the hunt for race wins, and while Harvey and Caine focus on each other, drivers like Tim Bridgman (Team Parker Racing) and Jota Sport pair Sam Hancock and Phil Quaife will be going for race wins as well as third place in the championship. Meanwhile, Charles Bateman (Team Parker Racing) will be bidding to end his season on a high note after a couple of troubled weekends recently. Rejoining the grid for the final two races will be Jake Rosenzweig (Team Parker Racing) and Pippa Mann (Team Eurotech), and Rosenzweig in particular has shown the pace to get a podium finish.Things are also getting tense in the pro-am1 category as local racer Tony Gilham (ReDesign Racing) has a five-point lead over Nigel Rice (Red Line Racing). Rice has been chasing back into contention over recent race weekends and needs to at least finish ahead of Gilham to clinch the title. They have had some fine battles over the second half of the season and the contest for the pro-am1 title should be another key feature of the weekend.Meanwhile, in pro-am2, Glynn Geddie (Parr Motorsport/Apex) is looking good for the title, but could yet be overhauled by Tommy Dreelan (Apex Tubulars/QServ) or Graeme Mundy (RSS Performance) should he have a bad weekend.Then, the fourth and final title to be decided is the team championship and that is looking good for Team Parker Racing after a fine season for the Leicester-based squad. With Caine and Bridgman scoring for Stuart Parker's team, they need only one podium finish from the weekend to put the team award and the £7000 prize for the leading team out of the reach of Jota Sport.After qualifying early on Saturday afternoon, round 19 will be at 5.35pm on Saturday, with round 20 scheduled for 1.35pm on Sunday