well we got the sens enhancer, got it all sodered on and went down the road for a little tuning, city driving around 45-55 then highways was around 60-70. had it a little to lean though when i first started stalled in my driveway, but after playing for a while i finally got all the controls where they are supposed to be, and no check engine lights saying to lean or anything now, and it runs normal with the hydrogen, but when we shut it off we don't have much power. we are still gonna take it and hook up an air/fuel gauge to make sure everything is reading were it should be for the safe side. i'm just friggen happy it works, wish we could get 100 mpg, but that will probably never happen. all we do have to do now is drive around and test, make sure everything holds good, and if it does, my little vx will have one. as for the tires everyone has there opinions about them, but mine i still think the smaller/lighter the easier, just like having two of the same vehicles one big wheels, and one small going a steady 65 then putting it in neutral and see what one stops first. to me the one with less friction will keep going, because there is less to stop. by the way do they make aluminum driveshafts and flywheels for the vx. likes to get me them if they do.