Races six and seven in the Michelin Porsche Open Series will be at Snetterton over the weekend of 12/13 June. It will be the second time in less than a month that the Open racers have had a double-header at the Norfolk venue. To date, Richard Chamberlain (935) has been the dominant force in the series with four wins from five starts. Only a broken driveshaft on the warming up lap last time out prevented a clean sweep of victories. Now, the Cambridgeshire racer will return to his local circuit aiming to add two more victories.Rupert Lewin has not enjoyed the best of fortune at Snetterton in his mighty 996GT2R. His last two visits to the circuit have been hit by engine dramas in pre-race testing, so he will be hoping to get to race this time around. If all is well with the stunning 996, Lewin could be giving Chamberlain his toughest contest to date this season.With Chamberlain and Lewin sidelined in the second race at Snetterton last month, Steve Donovan (911GT3RS) claimed class one victory and is again likely to lead the pursuit of Chamberlain and Lewin this time around.However, the man who swept ahead for overall victory in the most recent race was Craig Rapp in his 911GT3 Cup car. That cracking result completed a hat-trick of class two wins for Craig and he will be aiming to make it five next weekend.If Tony Brown can resolve the ABS problems that have dogged progress in his new 964RSR he should be able to take the fight to the GT3s in class two. However, with Nick Staveley, Kevin Harrison, Henry Firman and Gerald Harrison all running well in GT3s, Brown is heavily out-numbered at the head of class two.Paul Howell (993), Gordon Matthew (944 Turbo) and Chris Egginton (968CS) have all taken victory in class three, which remains wide open to a great diversity of cars.Meanwhile, the new for 2004 class four for 944s is proving a great success, with close racing amongst half a dozen evenly matched cars. Alex Eacock is the pacesetter with an unbeaten run of five wins, with Tim Bevan and Nigel Ainge as his major rivals.