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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, 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.
This seal is made by AJUSA, an aftermarket supplier of European auto parts. It has a two year warranty.
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
Z Series
E89 Z4 (2009-2016) > Z4 sDrive28i
E89 Z4 (2009-2016) > Z4 sDrive35i
E89 Z4 (2009-2016) > Z4 sDrive35is
$10.99
Chargepipe-Intercooler O-Ring Seal, Hotside (AJUSA) - E82 135i, E9X 335i, Z4 35i
O-ring seal between the hot chargepipe and the FMIC
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