first of all u got to determine if that piece of piping really have to flex. some pieces of flex pipe are needed in ur exhaust to prolong the other parts of ur exhuast system. ur engine moves, ur headers move but the parts of ur exhaust that are behind those like the muffler, don't so if u were to replace it with solid pipe, you'd break ur exhaust quickly. if that piece ur talking about needs to flex, then let it flex ccuz its like a shock abosorber for the rest of ur exhaust
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