Well...there isnt much you can do to fix it. You could weld those holes back in from the surface? But the past owner probably gutted the muffler too. Here is a link explaining some of this stuff:
http://www.newninja.com/forums/f98/m...ideo-3636.html
Your options are to wear ear buds if you feel too annoyed by the loud noise or to buy a slip on exhaust (2 bros, yoshimaru, etc) that will change the noise to slightly softer. But hey, in my opinion, your exhaust probably sounds badass for a 250 and is unique! It doesnt sound like the stock sewing machine lol. Also this is safer as cars can hear you better with such an exhaust. If I were you, I'd keep it!
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