smell coming from car

hello, i am new to this site. i own a 91 bmw 325i and love it but sometimes it acts up on me, lately ive notced a bad smell coming from the car, like rotton eggs, i cant tell where exactly it comes from, can anyone help me out , or have any ideas
-thanks, A

Is your wife in the car when you smell it? lol

Likely your catalytic converters failing