You can remove the air silencer and then take the stock air box out and replce it with either a cold air intake already listed above or you could go the cheap route and just put a K&N cone filter on the end of the stock intake tube. I have a K&N filtercharger cone filter on mine thats for a LX 3.8. But I have to caution you if you remove the air silencer and the stock air box. I used to just have the air silencer in but one day I decided that it was time to pull it out. Then I took the car to the car wash (can you guess where this is going). I normally take it to one of those expensive car washes where people hand dry your car after it has come out. Well I got the same car wash as I alway get; the normal wash with underbody wash. after I drove out of the car wash I noticed something really funny on the way home. So when I got home I popped the hood to find that there was water all over the engine and by the filter. I then realized that I had almost hydralocked my engine! I have gotten this same car wash dozens of times and never had this happen, and it was the first time I had taken it there since I had taken out the air silencer. So I figured that the water must have come in from where the air silencer used to be, or that it was a freak insident.
Just a little word of advise.
Shane