Yeah, my ZX-9R will do 10.15 ish stock. Its pretty easy to get "just" sub 10 but getting it under the 9.5 mark requires some work on most bikes. There are a few exceptions like the hybusa and the ZX-12R where only minor suspention adjustments and some sprocket changes will give you times under 9.5. I'd only put a nitrous system on if you really know what you're doing. That stuff can be real nasty, not only to control but have you ever seen a nitrous fire? I sure wouldn't want to be stradling that stuff.