09-04-2021, 11:16 AM
Less flippantly, the reason you're getting so much noise/rattling is because the "silencer" isn't doing what it is supposed to do. Ideally, if you can, it should be opened up and the incoming pipe joined to the outgoing pipe by a section of perforated tube, with the void around it packed with a heavy grade fibreglass wadding. Once re-closed you will find the exhaust note nicely muted but still sporty. You may even find that bottom end torque is improved slightly. While the silencer is off the car being sorted you could also affix some sort of flexible connection to the bonnet side, for example Triumph bonnevilles used to have flexible engine mounts to reduce vibration and they may be suitable.