Jdgul

Right guys, the loud metal to metal noise was the Exhaust it was loose!!, metal plate and welding done the job, got the rear discs and pads as it was an advisory last mot. Moreover the little knock from exhaust sides is still there, mechanic said your has had a new cat and it seems there's a stone or something in there that's making the noise?

Certainly is bizarre!. Funny you mention the heatshield initially it was rattling and I couldn't take the sound like you mention it was loud, hence I removed it, it was in bad condition. I Haven't put a new one on. Thanks Im going to take it to a mechanic on thurday, hopefully it gets sorted. 

I missed to mention prior to the noise appearing. I removed the rear exhaust heatshield as it was loose and causing a racket. Moreover yesterday I held the back box firmly and noise almost went away!, could it need a new heatshield?.

Hi everyone thanks ever so much for the input. I had a mechanic look at it today briefly he claims it's coming from front exhaust side flexi?, anyone had any experience with that sort of issue?. And no noise doesn't change with revs remains the same sort of a constant chirp

Hi everyone thanks ever so much for the input. I had a mechanic look at it today briefly he claims it's coming from front exhaust side flexi?, anyone had any experience with that sort of issue?.

Hi all, my bmw 320d e46 2004 sport mileage 109000 has recently developed a sort of chirp sound In the engine bay hot and cold constantly there started a few days ago and gradually got worse, can the e46 experts relate to this sound?, what can it be?, I am attaching a sound clip, any advice would be useful, thank you.

Voice_005.m4a