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@gridds
^ Yep. Not just the turbo design but also the exhaust.
The Merc engines have very short exhaust primaries, basically straight into a simple collector that runs down the side of the engine and into the turbo charger. Smaller, much lighter, requiring less heat insulation which is in turn again lighter and much more streamlined aerodynamically whilst putting more heat into the ERS-H.
Renault, and Ferrari have really lost the ball here. They seem to think you needed tuned, equal length (long) primaries, before going into the turbo charger. You don't really need the pulse effect if the turbo is sucking out the exhaust gasses from the cylinders.
For the small benefit in tuned exhaust there is a much costlier drawback of weight, aerodynamics and heat management.
The Merc is an excellent solution, with plenty in reserve and why the works team will easily run away with the championship this year. It's basically going to be Hamilton vs Rosberg for the WDC. The rest will fight amongst themselves in the also rans but this will make for some great driving and entertainment.