that was a good watch. great actually. I have some of the stainless filament on order. I've decided to print & machine the turbo. seal surfaces must be pretty much flawless and bearing races too so I know of a small machine shop who will work reasonably to provide the finish. I never realized the actual speed of small turbos was so high. I'm trying to design for 8-10psi boost, that should be an honest 50% increase in hp. My concern is will the onboard computer recognize the proper fuel/oxygen mix and be able to dump in the extra needed fuel? I might need to fiddle with that computer adjustment thing you guys use. Oh, and I'm toying with cooling the charge some way.