I just know the legality here in Southern CA because we used to do these mods back in high-school (pre Fast & Furious days) and would always get hassled. Reasons we probably got hassled were: 1) we were big groups of young teenagers. 2) we were always trying to stand out (loud stereos, loud exhausts, burnouts, flashy lights, etc) 3) we'd regularly attend the illegal street races.
Since I believe most of the NSX owners don't follow these trends, I think the likelihood of getting a ticket would be practically 0 for most buyers. Even if you did get a ticket, it would most likely be a minor "fix-it" ticket.
But seriously. . I these look like an AWESOME mod, like everyone else says. Quality looks top notch and I praise you for getting these on the market!
The only reason I'm not getting a set is because my car is red and I'm actually looking for a red set so that they blend in (even though red in the front is illegal ). But if I had a black, silver, white, or grey NSX, I'd be all over this in an instant!