ill grab a dual nozzle wet shot nitrous kit pretty soon and post some more numbers. its about the same price as an aftermarket cat back (nitrous kit is a little less) and will have much more gains.
i took the non res axle back mufflers off and went back to the super heavy stock nismo muffler - car is a little louder than stock but not much. anyone who asks in person i will tell them the car is stock
for anyone else thinking about building NA 370Z at high altitude i would encourage you to go boosted or nitrous first. ive had several turbo cars and am working on a trailblazer SS with LSA supercharger right now so id like to keep this mostly motor