Sa lazada po meron na replacement but haven't tried the performance..
Yes, the genuine Honda Air filter costs around P1400 something dati, ngayon mas mahal na. And the RS can dirty this up fast in metro manila-like environment (like less than 5K kms) lalo na pag napapasarap hatawan
Now, kung OK lang po sa inyo advise ko, based sa service experience ko sa honda casa and ayaw nyo ng pricing ng air filter nila, this is what I did:
Bought k&n washable filter sa US (around $40 plus the cleaning kit $10). Pag hindi ako magpapa service, k&n gamit ko, pag ipapasok na sa honda service ibalik nyo yung stock genuine filter. Kasi nung iniwan ko yung k&n at binilin na wag nila galawin, nag note yung technician na "air filter needs replacement", BAKA daw maapektuhan kasi warranty chenes. Nilinis ko lang yung 2 genuine air filters na nasakin at nilalagay lamang pag magpapa service sa casa. Kung naiiyak sa presyo ng air filter, mas malupit cabin filter P2500.. Noon..

.. Kaya bumili na rin ako k&n set for it and use the above workaround..