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The exhaust flexi pipe (flexible joint or bellows) absorbs engine movement and vibration to prevent stress cracks in the exhaust system. It is a braided metal section that flexes with engine rocking and expansion. A failed flexi pipe causes an exhaust leak, noise, and potential fume ingress into the cabin.
Flexi pipes are located between the manifold and the rest of the exhaust system, where engine movement is greatest.
Flexi pipe replacement involves cutting out the failed section and welding in a new universal or OE replacement.
Commonly searched OE numbers fitting Exhaust Flex Pipe from the TecDoc catalogue.