agreed with the bolts/clamps on show, have positioned mine so you can't see the bolts from the rear of the car, just the band of the clamps.
Now mine have 'sooted' up you can't really see the pipes inside the tips, no bigger for me.
yeah mine drones as well (Resonated), so the other one must be ear bleedlingly loud
going to sound proof the rear at some point, see if that will help
other than that i think it's a great improvement over stock and certainly gets the car noticed