I've got a un silenced straight through back box (bombardrone street race if your interested) which sounds fantastic on my 595. Today I had to take a dolls house to my parents which involved me removing the parcel shelf and folding the rear seats down. On route to my parents I didn't notice anything as I was driving slowly as not to damage the dolls house but on the route back with the seats still folded down when I got to a good bit of track(I mean road) where I floor it I honestly could not believe how much more noise their was in the car it sounded absolutely awesome. It would be to noisy  like in on a long motorway journey but when I go out for a blast this weekend I'm gonna have the rear seats folded down

I really did think that something was wrong with the exhaust at first as it was so much louder. Once I realised the reason and knew every thing was ok I had a blast.