I'm new to the list, so I want to introduce myself first.
I'm a Nissan Dealer in Belgium.
I'm also a authorized TEIN suspension dealer, a Stoptech-brake performance dealer and NISMO authorized Dealer.
The K&N 57i kit is only for CR engines, not for HR.
For HR engines only a filter element is available from K&N, but you have to search Nissan Note/ HR15DE.
A real CAI is not yet available for either HR15 or HR16.