Today, i got rid of my Apex WS exhaust and installed my new Greddy Evo system. I absoloutely love the sound and exhaust gave me some good gains. For those whos had the same exhaust for a couple of years, what do u guys do to take care of it? will my greddy stainless steel muffler change color as time goes by? will the sound change as time goes by? how do i clean the muffler to keep it from discoloring? im asking this cause i feel that i took such a bad care of my WS and wanna keep this one lasting for a while. Thanks.