I finally got around to trying this product, and wow what a nightmare! I followed the directions to a tee, but the majority of it ended up pooled up in my intake plenum rather than getting drawn through the engine. Some liquid solvent spilled out as I pulled the intake air boot to remove the hook straw from the throttle body after the can was empty, and it was at this point I knew I was sc$ew$d.
I pulled the throttle body to see if I could mop out the solvent, but there was too much in there to be practical. I ended up having to remove the entire upper intake plenum to drain and clean up the solvent, but the worst part is that the stuff that spilled out from the throttle body started eating the split loom and insulation on the throttle body wiring harness! The split loom got all soft like spaghetti, and the insulation on the wiring started to get discolored and hard. I sprayed everything down with electrical contact cleaner, and then flooded the engine bay with clean water after reassembling everything.
Do not use this product unless you want to potentially smoke your engine! I can't image how bad it could have been if I drove the vehicle per the instructions afterward with all that liquid solvent in the intake potentially sloshing right down into a cylinder. My guess is that the inline flow restrictor is a joke, because the solvent came out faster than I expected and emptied the can in about 5 minutes. If it was applying the correct amount of aerosolized solvent for the amount of air going into the engine, then there shouldn't be any liquid left behind.