just a quick update fellas about my Go's, ran a trophy race yesterday with my GX5 powered Losi's and i was getting between 10:05 to 10:45 on fuel with a 6.5mm restrictor and i was pulling away from the "big named" power plants on the strights, got about 2 gallons on these mills and they are starting to come to life hard core. tune is holding soild through out the race day i think the most i moved my needles were 1/4 to 1/2 all day