Today I went to Eneos and got my Waja a new K&N Air Filter and Denso Iridium Spark Plugs.
Despite the minimal increase in performance, it’s noticeable. I can feel the difference immediately when driving back home. Good stuff, at a fairly decent price. Eneos sold me the air filter for RM310, and all 4 spark plugs were priced at RM190.
Imran Jaafar 
hi imran, i stumbled upon your blog on google. just wanna ask cuz i too bought a K&N filter for my waja.
i tried installing the drop-in filter but found out that the clips on the air filter cover cant clip the K&N filter. its a few mm thicker than the standard air filter.
did you face a similar situation?
could you get back to me at twelveinchvinyl@gmail.com
thanks.