Hello Jappo
When I tested my 2002 S1 Aero 8 before buying (with 27000km on the clock) I noticed this ammonia smell and was advised by the buyer that it was the cats. All else being good on the vehicle I went ahead and bought it.
2&1/2 years and 20000km later I often get the smell under hard acceleration but have just become used to it. Believe my car is pretty standard other than Librands sports exhaust. Be interested though to see what other remarks this thread produces.
Cheers
