That's the thing, to open these things up and get more performance you really need to go with an aftermarket exhaust, which will always be a lot louder. There's some that are quieter than others but mostly they're all super loud.
Is it possible to take the innerds out of the stock exhaust on these (I don't have my XX yet so I'm not sure). That might be the best bet for you.
Is it possible to take the innerds out of the stock exhaust on these (I don't have my XX yet so I'm not sure). That might be the best bet for you.