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The engine should be mounted as rigidly as you can get it to prevent it from twisting. The exhaust must be hung as loosly as possible to brevent engine torque from flexing it. This will result in work hardening in the area of flexing, with cracking and leaks.
Energy Suspension makes polyurethane engine and transmission mounts that substantially limit engine movement over conventional rubber mounts. The engine doesn't torque to one side and push the sidepipes against the body, or flex the exhaust system.
The rear of the pipe is suspended with a bracket off the turnout with a bolt, and rubber bushing between the frame and exhaust bracket.
Result, no flexing.
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