Peoples, please help. I have a 1994 320i SE. It rocks.

But it could do better methinks. I have seena couple of car mags with induction stuff in, filters, hoses, ducting etc etc. I have never fitted one before

but want to get some info on how easy/difficult this is to do and whether anyone can recommend which induction kit is the best (noise/performance) and what actual bits of kit I need. I know this includes a replacement air filter (I think the cone shaped ones are probably going to get my vote) and some hoses but, let's be honest, I don't really know much more than that. Don't really want to have to spend more than £100 either....