Bought the norman hyde toga classic pipes for my 2010 triumph Bonnie on Friday. Fitted them that evening smeared the joints between the down pipes and the silencers with silicone. Let it dry over night. Then Saturday morning started it for the 1st time. WOW!!!! Could not believe the difference, what an awesome sound. Been out on the bike all weekend. Sounds like an old Bonnie used to. Pops a bit on over run but that just adds to the character of the bike. If anyone is thinking of enhancing the sound of there Bonnie ,I highly recommend the togas