Hi. So I'm finally noticing some initial signs of knowing that I'll need to replace my entire exhaust system soon. Underneath the passenger side is some noticeable fluttering sounds of an exhaust leak. Has anyone replaced anything regarding exhaust on their X? Mine is a 2006 with 137000 miles. Considering the X was manufactured in 2005, everything is already basically 13 years old. Any advisement would be great. Whether I should just replace everything from the engine block back or to just replace the catalytic converters or replace them and the muffler and tail pipe. Also, what would you recommend for replacement parts too. Should I just go with all OEM parts or could i buy a performance cat-back and have that put on as well. Thanks.