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Rein BMW Intake Boots & Hoses for BMW 5 Series E39 (1996-2003)

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

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$ 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.

Intake Boot

For vehicles with production date from 09/1998

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T#:591892

Part#: 13541435625

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$ 20.99 USD

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$ 20.99 USD

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Boot that attaches to the mass air sensor

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

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

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T#:363139

Part#: N203531-1

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$ 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

Intake Boot

For vehicles with production date up to 09/1998 and with secondary throttle body

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T#:402027

Part#: 13541740931

Ships in 4 Business Days

$ 18.99 USD

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$ 18.99 USD

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Intake boot for the air flow meter

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 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

Intake Boot

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T#:402080

Part#: 13547505838

In Stock at Vendor

$ 19.99 USD

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$ 19.99 USD

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Connects to the mass airflow meter

Rein Air Intake Boot - E39, E46, Z3

For vehicles with production date from 09/1998

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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

Intake Boot

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T#:594356

Part#: 13541703726

In Stock

$ 30.81

This product was last offered at the strikethrough price on
06-15-2026

$ 22.99 USD

Limited Qty Sale

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Qty

$ 30.81

This product was last offered at the strikethrough price on
06-15-2026

$ 22.99 USD

Limited Qty Sale

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This is the rubber intake boot that the Mass Air Meter clamps to. If your boot has rotted or deteriorated it will cause a rough idle and poor performance.

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