Squeaking/ticking

[montecole]

Hey, new to the group. I have a 95 C1500 with 154k on the body and 74k on a Goodwrench 350TBI. Recently I put on Y pipe duals and as a result I’m hearing a squeaking/ticking sound. Before this the truck had no exhaust besides the Y pipe and cat so I have no idea when this noise started. It’s loudest on the passenger side floorboard. Friends were no help. It’s loudest when driving. Oil pressure is 25-30psi at 500RPM/idle and 40-50PSI driving at 1500-2000RPM. It builds oil pressure and I can hear nothing at idle only when given throttle. If you let off completely the noise goes away. I’m not convinced it’s knock. I’m thinking the donut gaskets or manifold gaskets? Any input is appreciated even if you guys call me stupid . TIA and any help is appreciated!

 

[Erik the Awful]

Crawl under there and look for soot trails at all the exhaust joints.

 

[montecole]

I just got exhaust put on the truck and before nothing was audible. They only touched from the cat-back. It’s a squeak, almost like an idler pulley but it’s only loudest from the passenger side and while driving. Not noticeable at startup or idle. There are a couple soot trails but I know it has an exhaust leak somewhere.