On my 08 I got a NX wet system 4 nozzle with ss breaded line. Now, I custom mounted my system inside my airbox, running my fuel and nitrous lines into airbox via bulkhead connectors. I would suggest to anyone running poly line on their nitrous setup to NOT run poly line into airbox.
Trust me when i say this, its not if ploy line will break its when and when it does that means unmetered amount of nitrous going into combustion chamber. "And that aint good for no body!"... I started out with approx. 50hp shot on 91pump gas tuned via wideband contoller, fyi thats a completely stock engine including air filter and foot shifting. (Keep in mind I weigh in at around 285 pounds) I went from running 10.01 @ 137 mph to a 9.54 @ 150 mph. With my jockey on the bike, he ran a 9.29 but whats important about my jockeys pass was that at the top end of 3rd gear it hit a weird sounding rev limiter so he let off the nitrous button and finished the pass with no problems. I was confused at that point. No problems appeared on the wideband, plugs looked fine, bore scope showed nothing. The only thing I would come up with is that we were floating valves, due to the weight difference I am making the engine rev slower cause Im fat and my 150 pound jockey was allowing to engine to rev quick enough to start the floating process. Assuming this, I think we just got luck enough valves didnt make contact with piston/s. Also according the the busa shop manual, the gen II has only 30 lb at seat pressure valve springs due to the light tit. valves. Shortly thereafter, I installed the ape 52 lb valve spings (with the spacers installed) and a thin head gasket and bumped my pills up to approx. 80hp shot still stock pistons. The very first pass with my 285 butt I floated valves and bent 2.... In short, I advise to stay well below 50 hp shot (especially if your light) on the gen II because there is simply not enough valve spring pressure for much more than factory hp output. And I know 'THEY' might say this and 'THEY' might say that, but what do 'THEY' know?