I have GMC 3500 drw 4x4 w/LBZ. I run water only except in winter when I run washer fluid as anti-freeze. Truck has air-raid intake, 4" MSRP cat-back and DS Predator downloader (can't say I'm happy with DS). I run the 85 hp setting w/ water inj. towing 34' 5th wheel. I don't get over 1250 in EGT's. No way without water inj. That's going up a 6% grade. no engine codes attrib to WI, only Predator at 120 hp setting.SBCNX20;1565917; said:I dont want to run meth because of the low flash point and the pre ignition that goes with it. Has anybody run a water only system?