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These PowerFlex EXH-005 Polyurethane bushings on the other hand are 25%-30% stiffer and do not deteriorate in performance over time. The benefit of the increased stiffness is superior control of the exhaust...preventing knocks that might otherwise occur with your stock hangers. Sold individually. Use a bit of lube on these to slide them on and keep some lube on them (unlike rubber these need some lube or you risk tearing them).