[91LX2Bfast]

I'm a fan of keeping stock airbox when you can. Use the money you save from not buying a cold air kit and put it towards other parts.
One note: Some people trim their silencer so it makes the hole bigger, but still draws air from the fender. But in doing that, you're getting rid of the venturi shape thats built into the silencer. My brother has run his '99 GT many times with and without the silencer and there was no difference in times between the two. So he runs the silencer to get full benefit of cold air.