stock airbox is already have cool air intake design bro! if u want to DIY CAI u need to bore ur airbox, under the airbox have 1 small hole, u can install intake ram kit at there!
i had this problem for several time but quite often...
the problem is the "check engine" always illuminate for a few minutes during i drive and after warm up in the morning...i'm driving a kancil...
Yesterday my engine blown. Early symptom was the exhaust sound become louder. After several time over red line, Out of a sudden the rpm dropped and whole car shaking. Unable to push more than 3k rpm.