I've seen several flowmaster and magnaflow systems for sale on the German Ebay. You could contact the sellers, I bet they can get you what you want even if it's not currently listed in their ebay-shop.
Thats in KMs, note the 240kph on the outside ring . My car has got more than double your mileage, looks bad because I have US overlays with mph on the outside and my odo reads 229xxxkms