Let me know if that's a cat-back... I had a generic DTM styled dual tipped muffler and it's now making rattling sounds...it's annoying. I am thinking about going with WS or Greddy SP tho, heard they are quiet but still give a nice sound. I wouldn't suggest going non-brandname. It's a matter of quality and warranty I guess... at least go with some japaness company or good reputative ones...