New steel exhaust system cat fail, would sticking hydraulic

[mattyboxster]

I had a new steel system fitted last October and one of the cats sounds like a tin can is rattling inside it. I have also just had a hydraulic lifter sticking, is this likely to be associated to each issue?

[Krikkit]

Doubt it, unless a piece has broken off the valve which was sticky (very unlikely if the engine still runs!)

[mattyboxster]

Engine runs really well but has been popping more. There is a tiny hole in the cat at the end when it runs into the tail pipe with a smokey black mark on outside. Just hope nothing serious.....