I found this interesting info from the first link. "Notes:
This is a Race Only product that is to be used solely for competition. It cannot be used on vehicles that are operated on public streets, roads or highways. Its use is limited to closed-course and open-course racing that is formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, could be in violation of local, state and federal laws. Shipping Restriction: CA, NY, ME. more details on - https://www.carid.com/aem/aluminum-gunmetal-gray-cold-air-intake-system-with-red-filter-mpn-21-850c.html" What is that about? Emissions? Noise? More air intake = more fuel = more emissions?