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11 1/2 year old 220K truck and the only one I've replaced is the hot side at the turbo (with OEM boot). Seen 38 psi boost on them all many many times and not had a problem......yet. I wouldn't.
Ok. So no need to replace them in pairs? I thought the upper one goes bad faster or more often than the lower. Don't want to be stranded towing the fifth wheel again.
