Hi, right now I just have 2chamber flows welded on. my question is how much of a sound difference will i get if I switch to a full cat back, i ask this as I saw a cobra today and it sounded awsome( is that mainly due to the motor being a 4v) or is it the exhaust set up. I have bbk longtubes and bbk o/r xpipe. thanks for any help, could'nt really find an anwser in search