NOS? no had turbo on my atv before, s*** cost about $1500, my engine had to get rebored a week after using it so it had to go, it increased HP like crazy, could peal out in 3 or 4th gear easily.. now it only peals out in 1st and 2nd :/ I'm not sure what the max speed was with the kit, I'd say about 90 or 100mph, but w/o it (as is right now) it only goes 70mph spose its better then nothing, though I enjoy running from the cops down sand roads hmm, I really need to get a car though I only got the learners permit coz last year I aint have my social security# and didnt no where to get it (i r foreign.. lol) so I forgot bout it and this year when I turned 16 I went and got my learners permit.. pretty boring ridin with someone beside ya...