didnt know where to put this, so here goes

[Alonso1993]

i got a new catalytic converter put on my 87 325i, i went to a muffler shop to see how much a custom cat back exhaust would be and we get under and see that the mechanic who put the cat in reduced the exhaust to 1.5 inches a for a bout a foot before and after the catalytic converter in order to make it fit i beleive. what would you guys do in this situation? i mean i spent like 500 on this, and it looks like he has the wrong catalytic converter there. is there usually a part number i can look for to see if that is the proper converter. if so does anyone know the part number i do need? this way i can go back to him and show him he messed up.
also, what are the possible side effects to this if any?
thanks for any help guys

[ELVA164]

For future reference, there's an exhaust section that this would probably fit in. Part number I found is 11761716743 on realoem.com. I think the stock exhaust ID is 1.75" but with a stock motor I don't think the change will choke it much. More knowledgeable people feel free to correct me though.