Ive got a 99 EK w/ b18b swap and stock airbox from an integra. the airbox works fine but doesn't bolt up like OEM airbox so its just sitting in there. Would a 99-00 SI airbox bolt right up?

 

air box?? stock??? why???

ebay -> short ram $50

better sound, looks nicer (all shiny-n-stuff), i think it gives a better top end...

 

The EX and the SI use the same airbox. And yes it will work but you will have to shorten your intake arm a bit but im currently using an ls intake arm with my b18c swap in my 96 EX and it connects to the stock air box good once you cut it down with a hacksaw.