340i Exhaust

[iluvkefalonia]

I'm sure this is a simple question for the knowledgeable people on here. I have a 340i M Sport auto which sounds lovely on start up, but it looks like only the right hand exhaust is working, is this only on start up or is the left hand one a dummy? It's also evident after 1000 miles that the right hand exhaust tail pipe is getting noticeably dirtier than the left, I know I could crawl underneath and have a look but I'm the wrong side of sixty so will leave it to the younger folk to advise! And before you ask, yes someone of my senior years can utilize and appreciate a car with this performance.