I also dont think the exhaust is heating the tyres to the point of making them degrade quicker. They would have been aware of the heat flow around the rear and would certianly have been aware of any tyre heating issues.
I think we may see them copy Red Bulls exhaust. It saw Mclaren leap forward a second, and I'm pretty sure if its incorporated competantly we will see them move forward.
Adding the front wing will only come once that rear end is sorted, then we will see what the W02 can do.
An excerpt form Autosport:
"We knew we had a little bit of vulnerability on high fuel so I think we are going to have to think again about how we approach priorities over the weekend, because when we got into the race we started blistering the rear tyres which we hadn't seen in practice," Brawn told the BBC. "So that's why we fell away so quickly.
"Then as the fuel load came down that problem went away and the pace picked up and we started to get respectable again.
"We had run [the fuel level] in practice but obviously we were short of time because of the rain, and while we ran Friday afternoon with high fuel, we didn't see that problem. I think what's clear in this racing is that qualifying is probably the least critical thing now and having a good race set-up with the correct number of [sets of] tyres is the most important thing."
Ross Brawn