Hi M8, I have SP Enginering exhausts fitted to my 05 FZ6 and I can highly recommend them, I assure you they are F****ing loud even with the baffles/DB killers fitted. All my mates think it sounds awesome, just like a moto GP bike! I would'nt even think about riding on the street with the baffles out! The cans are not stamped with a BS mark, but SP Engineering say they are road legal. When I got my MOT done the guy just said they are loud but just gave me an advisory and it passed ok!! I have also got the decat pipe prom SP fitted to mine which makes it slightly louder still!!