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I'm bringing this thread back because I'm planning to try this if I cannot locate a 128i performance exhaust anywhere. It would not be hard to make the 135i PE fit on the 128i. The inner diameter of the 135i exhaust seems to be about 67mm and the sleeve that comes in the 128i PE kit is 65mm. That means the 135i pipe should fit over the stock 128i pipe fairly snugly if you cut it.
The bends and hanger mount on the 135i PE seem to be in exactly the same place as 128i. That gives you two options. You can leave the 135i PE exhaust alone and use a thicker gasket at the mid-pipe and connect them that way. You could also cut the 135i PE inlet exactly how the 128i PE pipe comes from the factory and have a muffler shop weld them.
The only question is, how will it sound? Is the 135i PE inherently louder to make up for the turbos? I don't know anyway to answer this without trying it.
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