Chargepipe-Intercooler O-Ring Seal, Hotside - E82 135i, E9X 335i, Z4 35i

This part is listed by BMW as BMW part number 11617791470 (11 61 7 791 470) and is described as Genuine BMW Preformed Seal 11617791470. This is a large o-ring that seals the hotside chargepipe from the turbo to the front mounted intercooler on N54/N55 E82 135i, E90/E92 335i, E84 X1 28i/35i, and E89 Z4 35i/35is. Without this seal, or if it's damaged, charged intake air coming from the turbo(s) will leak on the intercooler inlet and result in a boost loss and poor performance. The seal has a more defined shape and is designed to fit a certain way over the intercooler inlet, which is why BMW calls it a preformed seal.

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BMW Fitments:

1 Series
E82 / E88 (08-13) > 135i
E82 / E88 (08-13) > 135is
E82 / E88 (08-13) > 1M (11-12)
3 Series
E90 / E91 / E92 / E93 (06-13) > 335d
E90 / E91 / E92 / E93 (06-13) > 335i
E90 / E91 / E92 / E93 (06-13) > 335is
E90 / E91 / E92 / E93 (06-13) > 335xi
X1 Series
E84 X1 (2013-2015) > X1 28i
E84 X1 (2013-2015) > X1 28i xDrive
E84 X1 (2013-2015) > X1 35i xDrive
Z Series
E89 Z4 (2009-2016) > Z4 sDrive28i
E89 Z4 (2009-2016) > Z4 sDrive35i
E89 Z4 (2009-2016) > Z4 sDrive35is