Hello together, I’m new here and unfortunately with my Smarti the problem that it sounds like a puffed-up Trabbi. In other words, the exhaust / tail muffler has a high leak to the lamda probe (Riss). It has been known already, but only held for a whole week. Since the exhaust with Smart crammed about 750,- € costs, the question arises to me how and if you get to it cheaper. Under the part no. A4514901381 in combination with manufacturer’s key etc. is given. There are also significantly cheaper versions on the net, but they all look strangely different. Does anyone have a tip or experience on this?