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The rubber intake boot connects the throttle body to the HFM boot on the E46 323/328, E46 325i M54, E39 528i, and Z3 2.5/2.8. It also connects to the idle control valve (ICV). It's after the air filter and mass air meter so any rips or tears on the boot material will allow unfiltered and unmetered air into the engine. And since vacuum and air pressure within the engine are closely managed, any air leak can be a serious problem. Air leaks from a cracked intake boot can cause your E46, E39, or Z3 to run rough, poor idle, throttle surging, stumbling, hesitations, and misfires. These can be caused by other things but a leak in the intake boot is easy to check and inexepensive to fix! This is a less expensive aftermarket version of the original BMW rubber intake boot and comes with a two year warranty.
BMW Fitments:
3 Series
E46 (99-05) > 320i
E46 (99-05) > 323Ci
E46 (99-05) > 323i
E46 (99-05) > 325Ci
E46 (99-05) > 325i
E46 (99-05) > 325xi
E46 (99-05) > 328Ci
E46 (99-05) > 328i
5 Series
E39 (96-03) > 525i
E39 (96-03) > 528i
Z Series
E36/7 / E36/8 Z3 (96-02) > Z3 2.5
E36/7 / E36/8 Z3 (96-02) > Z3 2.8
$7.35
Replacement Intake Boot - Lower - E46 323/328, E46 325i M54, E39 528i, Z3 2.5/2.8
Common source of intake & vacuum leaks, poor idle, rough running, and lean condition codes. Replaces BMW part #13541435627
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