Quote Originally Posted by DHall1 View Post
You could perform a bench test at the full rated voltage to both RS6 pumps then go on the hunt for the proper intank units. Take a fuel line off at the engine and plum something down to a gallon bucket. Time the test to fill the gallon and extrapolate from there.
I think you see what my ulterior motive is here.

I need to know whether the stock S6 fuel pump and delivery will be sufficient for supplying the RS6 lump.

I've got an S6 tank, lines, fuel pump w/ constant 12V, etc. and there's nothing in common with the RS6 unless the difference in P/N's is code for the flagship tax.