had a listen to me mates shogun with a 3 inch straight through pipe and blimey it gave me a headache when he reved it guess i was just unlucky, thought on the slip he gave me it put replace silencer, and take it for mot, so if i put a backbox on it should be fine, as its got a box on,, we shall see, i dont really want to get another middle box as i just bought the straight through pipe from steve parker, and my rear pipe needs replacing as it looks a tad rotten,