They are improvements in your opinion, they are not improvements from sense of Honda's design intent when they built the nsx.
You are nitpicking either silly convenience items, such as the smartenna, or personal preferance items, such as exhaust note, these are irrelevant to the discussion.
Beyond these you claim a vented hood fits this challange, but a vented hood is a compromise in several ways; you will see only an aesthetic benefit on the street, unless you're driving in a highly illegal fashion, and its performance benefit is manifested in increased downforce, which means slower top speed, as well as increased fuel consumption - if you look at the construction of the type r you will find there is a panel underneath the front end with the inclusion of this vented hood, to create a low pressure zone, and there are also other aerodynamic tweaks, such as a larger rear spoiler and rear diffuser to balance the hood out, all working as one system, after significant R/D by Honda. If your DIY modification ends at just the hood how is this actually going to effect the handling of your nsx?
You will still see the downside, but you are now playing aerodynamicist with only the butt dyno as your R/D tool.
Weight loss is great, but from reading your responses it is as though you want to pluck weight anywhere you can find it; weight loss of a pound or two from an intake scoop on one side of the middle of the car, weight loss from the exhaust at the bottom of the back of the car, etc. etc. etc. - how does this truely effect your handling, at the extreme point where this weight loss makes a difference? Have you compromised the design of your nsx in an effort to make it better? This is the danger of aftermarket.
