Would anybody know what replacement product has taken the place of the GM "top end cleaner"(no longer manufactured) that Subaru recommended to use

Subaru now has a fuel system cleaner package that includes a top end cleaner, we just got them along with some special tools at my dealership. The EFI cleaner is pretty slick, it's a can of cleaner that you thread into a regulator that is attached to the fuel rail, no external pressure source needed.

I'm pretty sure the components are available separately, check your local Subie dealer.

seafoam