Air flow meter - I know, bear with me

[Alec]

The noises are funny, its the odours that worry me lol. Could just be the baffles in the exhaust then as a few others have said. Or possibly an air leak. If its running alright then it might just be a case of living with it, or putting the stereo on, sultans of swing usually does the trick for me lol

[dadrathers]

Faithless - God is a DJ

[Alec]

Tune. Let us know if u do ever find the source 

[dadrathers]

I will find the source - might take me a while - then I will let you know!!

Cheers all.

[weazgti]

You tried banging the exhaust with your hand?
Broken up baffle will rattle when you bang the offending box.

[dadrathers]

Not tried banging the exhaust - next time I have it up in the air I wil take a close inspection of the joints and do a bit of tapping.