I tried the new RB6 wishbones (UM713B) with the new shock mounting holes for round 1 at the RHR national...(run the inside hole on the 3 hole side) In practice I ran the flat kit arms and although the car felt good, it felt nervous and on edge.. I feel that this is because I run a short rear link to help the car pivot/rotate how I want it..
When I went out for round 1 the car felt a million times better and felt like I could drive it with more confidence. On power over the bumpy stuff felt much more sure footed... I changed a number of other things on the car to compensate running these wishbones knowing the RB6 arms give a lot of mid corner... Rear shock ends, rear springs, RF insert and RR insert to wider also changed the spacers under neath the RF and RR holders..longer rear link also.. I'm running 2 x 1.6 and 2 x 1.7 ... Car was spot on for RD3... And was on for what would have been a 37 in round but got tangled up with a back marker whom I thought was letting me through ended up 46.. Then rd4 had a rain affected run.. Started racing just before we went out.. Qual f10 finished 5thi think.... I will sort out a set up sheet and post but I urge people to try it and let me know what they think!

Source:

N. Caro