Horner said:
It (RRA) needs to encompass all aspects of the car," said Horner. "Dealing with equivalence is always quite dangerous. Each of the teams has a different make up, different ownership.
"Some belong to motor manufacturers and some are independent and, if you look at the things that work, like the testing, like the wind tunnel hours, like the restriction in personnel, the things that you can touch and feel work quite well. But as soon as you start trading equivalence of hours versus external spend, that's where it seems to run into some difficulty.
"There's a willingness from all of the teams to try and contain costs, it's just the manner that you do it. And you can't exclude the engine from that with some teams producing their own engines, so it's important to look at the teams as a whole rather than cherry-picking the chassis."
This is very much in contrast with the official statement by Mercedes. They say that the power train needs no inclusion in the RRA.
In my opinion, according to the FiA expert group and according to all announcements of FOTA between summer 2010 and November 2011 an engine RRA is needed to prevent a cost race.
Simple logic will tell you that there will be massive engine cost increases if there is unrestricted development again. Unless you actually define a control engine supplied by one supplier you will always have cost escalation without cost control.
Red Bull and Ferrari are both promoting something that I think is correct. Power train RRA is necessary but there should also be a reduction of the competitive advantage from aero. The sooner they start to recognize that both points need to be accepted the better for F1.