so i checked out an 04 cbr and loved it. 19k miles and selling it for 3,700. tons of upgrades, very good condition. guy let me ride it and it felt great. i recently bought a shadow but for some odd reason i want a cbr again. my question is.. i noticed the oil light was on. guy told me that when he bought the bike (a year ago) the guy HE bought the bike from told him the light was on bc of the aftermarket exhaust. what do you guys think?? should that be a red flag??