Alright guys...I have given up and need some help. I put thorley tri-y's on my 87 K5 about 8 months ago and I cannot get ride of this stupid exhaust leak I have welded the y-pipe slip fitting and replaced all the gaskets w/ crush gaskets and it wont go away. I cant really hear it when I rev the engine out of gear but in gear its super loud (almost as loud as my magnaflow)...its a whooshing sound w/ some minor soft ticking. Also...the main colector flange bangs my frame right at the tranny crossmember...any ideas on this? One of the things I was thinking was maybe my egr is leaking...has anyone had this problem? Any ideas you guys can give would be awesome. THANKS!