It's interesting how many people misunderstand what the HS30-H model was for, and what it allowed Nissan to do.
Like all homologation specials, it was sold to the general public with the specific intention of legalising parts for race use. In doing so, it allowed the factory - and privateers should they be so blessed/connected/wealthy - to use parts that were extensions of, and attached to, the homologated parts. Those homologated parts also allowed evolutions and extensions to be based upon them...
Nissan's showroom model HS30-H was never sold with an airdam/front spoiler, but the Grande Nose was designed to be used in competition with exactly that. If you're looking solely at the road cars, you'll never understand the race cars.