with the nt16 tuned correctly and the 11/14 2 speed you should see 40-45 mph.... I hit a little more with the os18 running a bit lean, saw upper 45-47mph..with the stock mt2 tires.. the acceleration was much better... I am having issues with the maxx tire/wheel combo at the moment... with bent t-maxx axles and destroyed diffs, I have been rebuilding lately... when I first did the mods, I would say the speeds were around mid 40's, but it was a nightmare to drive fast... the track was much more fun... I will be replacing the proline bow ties for some revo rubber, more suitable for the street and lighter and see what happens.. I have one more axle to finish and will test again on sunday...