BimmerWorld Silicone Throttle Body Boot, Stock HFM - E36 325i/328i/M3, Z3, M52, S52

Silicone intake boot for the standard 3.0" HFM on E36 323i/325i/328i/M3, Z3 2.8 (97-98), and MZ3 S52.

Our BimmerWorld Silicone Throttle Boot is the perfect replacement for the original weak rubber intake boot on your E36 or Z3. The stock unit is often made of cheap rubber that becomes brittle when exposed to heat. Add in vibration from aggressive driving (or worn motor mounts) and cracks form in the accordion rubber leading to air and vacuum leaks and lean condition faults. The design is also not ideal for making power. The bellows design creates flow turbulence and drag with abrupt transitions over a short length. Our BimmerWorld-spec silicone boot easily solves all of these problems and outperforms the stock boot design.

We've found a silicone hose manufacturer to make this intake boot to our exact specifications, directly replacing the stock rubber boot and flowing considerably better than the OE part. The high-quality 4-layer silicone construction will withstand anything you can throw at it for years to come. No more dry-rotting rubber!

Power increases from 3-8hp seen in testing from this piece alone!

Fitment is for all E36 and Z3 cars using the M50, M52, S50US, and S52 6-cylinder engines. Our boot includes two breather ports and plugs to cover those ports when not used depending on your specific configuration. The length is a bit longer than stock on purpose so you can trim the inlet end for a perfect fit with your intake.

ASC-delete: This boot also allows the removal of the factory traction control throttle body (ASC) for additional power gains. If you wish to keep the ASC throttle body, this boot will not fit.

Notice of Emissions Non-Compliance. This product is a direct replacement for the original and closely replicates or improves on the original in fitment, form, and function. As a direct replacement upgrade it has not been designed to trick or disable any emissions controls. It is designed to work with all factory emissions controls in place. However, it has not been evaluated nor tested for emissions compliance. Therefore, it is not legal for installation or use in California on any pollution controlled motor vehicle. It is not legal for installation or use on any pollution controlled motor vehicle in any state, province, or jurisdiction governed by, or which has adopted, CARB or EPA regulations.

BMW Fitments:

3 Series
E36 (92-99) > 323ic
E36 (92-99) > 323is
E36 (92-99) > 325i
E36 (92-99) > 325ic
E36 (92-99) > 325is
E36 (92-99) > 328i
E36 (92-99) > 328ic
E36 (92-99) > 328is
E36 (1995) > M3 3.0
E36 (96-99) > M3 3.2
Z Series
E36/7 / E36/8 Z3 (97-98) > Z3 2.8 M52
E36/7 / E36/8 Z3 (98-00) > MZ3 S52