I went to Tire Discounters Performance Center today and asked about an exhaust. I want to put a Flomaster 50 SUV on my 4.7. He told me that flowmaster does not make an exhaust for the XK :icon_confused:, but some company that starts with a "D"(i can't remember the name) has one. To install, we would have to replace all of the pipes, the cat conv, everything. (icon_confused:x2)+=:headbang:.) i told the man that i know of multiple people that have this same equipment on their XK. He told me that it was a custom modification. i have read many posts and notice that quite a few members have the Flowmaster 50 on their jeep and was wondering if you had to replace the entire system.