It's a 'taste' thing, Americans prefer dual-duals, or just dual rounds. Big rounds, or squares are usually considered 'rice'. However Rounds and squares are largely a Euro mod when on bimmers, here they are usually found only on Asian cars. Your side of the pond it's not such a rare site as here.
Personally, I like to see the gains and hear it before I declare it anything, even if I don't exactly like how it looks either. Who makes it, and is it just a muffler bolted on or a full cat-back run system?
Keep posting pics, I like watching conversions, gives me ideas for when this car is no longer my DD. [driving2]