i also have the werks high flow cat....and the original bolts have pop off!!!! lucky i work in the "fastener" business so i upgraded them to grade 8 bolts and nuts.....also it was leaking as well i have a very NASTY!!!! BACKFIRE ....I'M THINKING OF GOING WITH THE SOLO "CAT" .... CAUSE WERKS ALSO GAVE BAD CODE'S ......