I have an Audi S4 B9 , on cold mornings I only get vapour from the right hand side and when putting my hand over the tailpipes it feels like there is less pressure on the left side, is this normal ?

It seems normal but would like to hear from others too.

I'm going to make a wild guess here....that it's to do with the "pipes" on one side are purely cosmetic...and only one side actually "exhausts" ....as I said...it's only a guess....so please don't shoot me down...

I have just bought an A4 Avant - 2.0 Tfsi quattro 252 - it has single dual tailpipes and I noticed vapour coming from both sides yesterday when running in the cold - not ure if that helps, but I was under the impression that they are both real pipes and not one being fake on the quattro and S4. The god news, I was told many years ago by a garage owner that vapour coming out of the eshaust is a sign the engine is running correctly.

‘The good news……’ - really! There are many variations of ‘vapour’ being emitted from exhausts, most of which are undesirables. What garage in Cardiff is that then, so I can avoid them? Unless they are having you on! 
Kind regards, 

Gareth.