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The MPE when optioned on a car comes in two parts the MPE Midpipe and the MPE muffler. In all f80/f82s with the MPE there is four parts to the exhaust. Downpipe (one) first midpipe with secondary cats (2) second midpipe (3) , muffler (4). When the OEM MPE is installed part 2 is cut at the dealer to slip into the MPE reusing the oem secondary cats. In order to run the MPE muffler with an AA midpipe for example you will need existing down pipes (1) AA midpipe (2), MPE midpipe cut to fit AA Midpipe (3) and the muffler (4). The fabspeed part only replaces part 2 and is not a complete mid pipe section. You can review the diagram of the accessory on RealOEM.
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