I have a Spitfire 4.0, predecessor to your mount, 21hp Urai-J 4.5. I am running a glided Ti wand with 9 flow @ 500psi. Cleaner, drier, faster. Water temp approx the same, maybe a touch more, with much more 'delivered heat', that is more Btu's hitting the carpet. Also if you are using a live vac hose reel, stop it!