I did this. Cost me $25 total and it sounds very cool! I bought a filter for about $22.00 and a plastic plumbing pipe with a divider to make the intake and the stock hose stay on with no movement. Fits perfect. Now all I need is to get a filter for the engine. That thing stinks! :) Do the CAI sounds louder. Mine is pretty loud, but you can barely hear it over my exhaust. My friend has a 99 Si and his CAI ROARS! It's extremely loud. I wish mine was like that. Think it would be louder with a CAI?
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