The main reason as to why you should take your car to a dyno to tune your nitrous to your engine is because most, if not all dynos, have wideband o2 sensors that are far more precise at detecting your air-fuel ratio.
There is an article on an wideband air-fuel monitor that you can install in your car in the current Super Street. The product runs nearly a grand though, MSRP.
There is an article on an wideband air-fuel monitor that you can install in your car in the current Super Street. The product runs nearly a grand though, MSRP.