I know this question was posted EONS ago. But man the only two posts at this time were pretty much all wrong. The only difference is seats, struts and spoilers oh and the S on the trunk. You can make a 535i an is by bolting in the seats BUT you need the wiring harness from the old I.S car or you have to make a slight addition to the wiring, this is to get the power leg support thing to work, drilling some holes and sticking the spoilers on remove the struts and swap over the bilstiens struts. And if the 535i that is soon to be a perfect I.S does not have a limited slip then you have to change that too. Oh and if you want stick the I.S chrome thing on the trunk after you remove the i. I usually remove the whole 535i and toss it in the garbage. I like to keep them guessing. And there you have it a perfect I.S. ta da.
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