the manifold wouldn't have to be changed theoratically.. save for maybe the bolt patter and angle that the turbo sits. by just flipping it 180 wouldnt that gain the desired effect without increasing exhaust distance??
TBH im a little surprised a company hasnt done this on a show car yet. i mean 2 snails up top would look completely BA
something like this would be perfect. spool time increase would be neglegable and IMO it would make everyone that looked under the hood happy in the pants...