Welcome - and another DOHC 450 owner here. While I realize your avatar explains it, there are a lot of Scramblers here so letting us know which size yours is always helps when it comes to information and assistance. Once you reach 10 posts you'll be able to add that info to your signature so others won't have to ask (in case you change your avatar). The older CL450s (K2, 3 and 4) had a nice exhaust note from the stock system. Any pictures of your bike? We love pictures here...