AEM do a CAI (Cold Air Intake) for '98 to '02 4 cylinder Accords.
Part number is 21-415
Comes in Blue, Red, Silver or Polished.
Not cheap at roughly £200.
This is probably not the only application, just took a shot and came up with a well known brand.
When searching for parts, it helps to use your engine code, which is F18B2.
I think F is the block, 18 stands for the displacement and B2 is the type of head.
Also search for your year range which is 98-02.
You will find a lot of items I've no doubt. Make sure you join forums for Honda Enthusiasts and for your specific Accord, which is a 6th gen. You'll have more luck with American forums as Accords are very popular over there. Not all the information will carry over but you will learn a lot.
Have fun!