Why do you want to get a big brake kit? If it's for looks, then by all means go for it. If you're looking for better braking performance, though, you will do more for your braking performance by getting stickier tires on 17"/17" or 17"/18" wheels than anything a big brake kit will do for you. (For most NSX owners, a big brake kit won't increase braking performance. Are you actually having any braking problems, other than "green pad syndrome", i.e. fading when the brake pads are new?)