Mercedes GP finally did what we are screeming for almost 3 season. Use every race weekend as a "practise" weekend. 
Lots of people including me always said that they should try different parts like; exhaust, wings, suspensions, diffusers.
And finally they did it! It took them 2.5 years to do this. So i think they will be WC somewhere around 2020!
			
			
									
									



