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You don't need the y pipe, it serves as a resonator delete, some go without it. I think your bigger issue may be that this is a part for the 135i and not 128. I don't think they're interchangeable. I'm assuming you have a 128i due to your username.
Edit: your part number would be 18102208804
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2011 E82 N55 135i
///M Sport • 6MT • Crimson Red/Black Boston Leather
BMW PPK• BMW PE • BMW Aero Kit • Blacklines • Arc 8's • VRSF Charge Pipe • B12 Pro-kit
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