I had the same problem with my Berk exhaust. First I had the hangers moved to raise the exhaust higher, but the rubber gromets stretched again making it rattle off the center cross brace. What I did was used 3 inch pipe clamps and placed them over the stretched gromets and jacked the exhaust up to give me a fingers width clearance and tightened the clamps down. Worked out nice so far. There is still some give because its a clamp over rubber, but it can't sagg now.
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