yeah the space we have to run in is about 1/2 a mile long and prob 1/3 mile wide i can hit top speed though in only 156 feet so i can do it just about anywhere the tests they did with the nx kit were on a tmaxx can't remember and it added 8 to 10 mphs on a truck but i can't wait to see what it will do on my ct4 need to rig a micro servo to my third channel for the on off to the nitrous becuase it has a full throttle switch prob be about a month though before anything happens because the spectrum dx3 is a piece of crap so far the third time i sent it in, it started to glitch on me and i smashed my first ct4 into a wall oh yeah if you are going to upgrade the ct4s just get the ct4r kit saves you like 350 dollars if you add all the upgrades individually the clucth on the ct4r is 105 by itself. but i will have some pics up real soon and i will label everything i did to my car only about 4 months into the hobby and probably further along in knowledge than everyone at my hobby shop i seriously have to even use their computer to find the right parts lol.,, yeah a lot of tricks with my ct4 that i can show with the pics plus you have to see my crashed one it looks like a taco now lol.