Hey getting new pickups soon and thought about covering for cosmetic reasons only...will it change the sound at all? or amount of output?
My Rig...

2003 Ovation Collectors Series
Custom U.S.A. Parts Strat
Gibson SG Faded Special

Crate V50 112
Fender Sidekick Reverb 65

Boss CH-1
Boss CS-3
Boss DS-1
Boss NS-2
Original Crybaby
They say that metal covers 'sweeten' your tone, ie make it more round. Often this is a good thing. It's cos of how they affect the magnetic field and all that...

However, the difference isn't always too evident.