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Rein BMW Intake Boots & Hoses for BMW 3 Series E46 (1999-2005)

Clear BMW chassis

The intake boot provides a pathway for air from the air flow sensor to the intake manifold. On most BMWs the boot is made of rubber with an accordian shape that allows the engine to shift and vibrate. As with any rubber component the rubber can dry out and crack and that can lead to serious running and drivability issues. A crack in the boot means that air is entering the engine that is not being monitored by the airflow sensor. The engine computer relies on data from the airflow sensor to set the fuel mixture in the engine. Excess unmetered air can result in lean condition faults, rough running, misfires, and other performance issues. For misfire and lean condition faults, check your intake boots first.

As an alternative to the original rubber, we also offer silicone boots that are both stronger and last longer with a 4-layer silicone design. Samco silicone boots can also decrease your BMW's intake turbulence and restriction by replacing the accordian design with a smoothed internal surface. Samco boots are also perfect as part of a kit to eliminate the factory traction control system (sometimes called an ASC delete boot).

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Rein Silicone Vacuum Hoses - Blue - 5 Meters (3.5mm ID)

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T#:379090

Part#: 11731259996-5

In Stock at Vendor

$ 38.99

This product was last offered at the strikethrough price on
03-17-2026

$ 33.99 USD

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$ 33.99 USD

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This silicone hose has an inner diameter of 3.5mm and outer diameter of 7.5mm, is blue in color, and arrives in a 5 Meter section that can be cut down to size.

Rein Cloth Braided Fuel/Vacuum Hose - Black - 5 Meter

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T#:378470

Part#: N203531-5

In Stock

$ 80.05

This product was last offered at the strikethrough price on
06-09-2026

$ 62.99 USD

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$ 62.99 USD

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Replace your cracked or frayed fuel or vacuum lines. 3.5mm ID

Rein Silicone Vacuum Hoses - Black - 5 Meters (3.5mm ID)

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T#:51848535

Part#: 51731257971-5M

Ships in 1 Business Day

$ 38.66 USD

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$ 38.66 USD

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This silicone hose has an inner diameter of 3.5mm and outer diameter of 7.5mm, is black in color, and arrives in a 5 Meter section that can be cut down to size.

Rein Air Intake Boot - E46, Z3

For models with the M56 SULEV engine only - not compatible with the M54B25 engine.

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T#:379640

Part#: 13541438761

Ships in 2 Business Days

$ 28.99 USD

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$ 28.99 USD

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Connects mass airflow sensor to air intake tube

Rein Air Intake Boot - E46, Z3

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T#:555163

Part#: 13541705209

In Stock

$ 17.99 USD

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$ 17.99 USD

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Connects directly to the MAF

Rein Cloth Braided Fuel/Vacuum Hose - Black - 1 Meter

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T#:363139

Part#: N203531-1

In Stock

$ 12.99 USD

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$ 12.99 USD

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Replace your cracked or frayed fuel or vacuum lines. 3.5mm ID

Rein Silicone Vacuum Hoses - Blue - 3 Feet

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T#:378472

Part#: 11731259996-1

Ships in 2 Business Days

$ 6.11 USD

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$ 6.11 USD

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Replace your cracked or frayed vacuum lines. 3.5mm

OEM Rein Air Intake Boot - E46 Z3

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T#:386410

Part#: 13541438759

In Stock

$ 29.99

This product was last offered at the strikethrough price on
06-29-2026

$ 21.99 USD

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$ 21.99 USD

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This intake boot connects directly to the throttle body. Susceptible to cracking over time, this boot could be the cause of a check engine light, showing that the engine is running lean, and rough idle issues.

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Rein Cloth Braided Fuel/Vacuum Hose - Black - 20 Meter

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T#:378471

Part#: N203531-20

Ships in 4 Business Days

$ 363.52 USD

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$ 363.52 USD

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Replace your cracked or frayed fuel or vacuum lines. 3.5mm ID

Rein Silicone Vaccum Hose - Black - 65 Feet

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T#:378475

Part#: 5173125797120BLK

Ships in 4 Business Days

$ 175.99 USD

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$ 175.99 USD

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Replace your cracked or frayed vacuum lines. 3.5mm

Rein Air Intake Boot - E39, E46, Z3

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T#:362650

Part#: 13541435627

In Stock

$ 16.99

This product was last offered at the strikethrough price on
06-11-2026

$ 14.99 USD

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$ 14.99 USD

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Connects directly to the throttle body

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