Yep, i use the Water Wetter too and also think it helps. Intuitively, i would guess it gives 10%~15% improvement.
Maybe I should try 50/50 mix of water wetter and antifreeze! Boy, that would be expensive.
What would you all make of this idea: i added a fluid air intercooler and pump the water to the back of the Pinz to a radiator and fan. They are on hinges so i can rotate in to warm the rear of the truck in winter, or blow it out in the summer.
What if i hooked up the oil cooler to this separate cooling circuit, post intercooler? That would suck some watts from the engine, and retard the cooling of post turbo air.