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The rubber intake boot connects the air flow sensor with the throttle body boot on the E46 330i and Z3 3.0. It also fits 2003-2006 E46 325i/325ci with the M56 SULEV engine. 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/Z4 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 an intake boot manufactured by Rein Automotive - an original supplier to BMW for many other engine parts. As an OEM it meets all of BMW's original design, fitment, and performance requirements and is TUV approved. OEM-type parts like Rein are the best alternative to more expensive Original BMW parts because they are virtually identical without the inflated price tag. This part has a two year warranty.
BMW Fitments:
3 Series
E46 (99-05) > 325Ci
E46 (99-05) > 325i
E46 (99-05) > 330Ci
E46 (99-05) > 330i
E46 (99-05) > 330xi
Z Series
E36/7 / E36/8 Z3 (96-02) > Z3 3.0
$13.99
Throttle Body Boot, Lower, Rein - E46 330i, Z3 3.0
Common source of intake & vacuum leaks, poor idle, rough running, and lean condition codes. Replaces BMW part #13541438759
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