SMG Components for BMW 3 Series E46 (1999-2005)

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The sequential manual transmission is an excellent gearbox that provides lightning-fast shifts and manual control. Due to the cutting edge design and awsome performance it allows, certain components may need to be serviced from time to time.
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CSL SMG Expansion Tank Bracket
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Turner Motorsport - Corporate Logo
T#:19395617
Part#: 049798LA01
In Stock
Sale - Save 40% $ 32.99
$ 19.79 USD
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Sale - Save 40% $ 32.99
$ 19.79 USD
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Used when retrofitting an OEM or aftermarket CSL intake on a vehicle with SMG transmission.

Its no secret the CSL intake plenum is the pivotal upgrade for your S54. If you are fortunate enough to have an SMG equipped vehicle you are going to need a bracket to relocate the expansion tank. Our Turner motorsport bracket fits perfectly with the engine bay to facilitate the installation of your genuine or Turner branded CSL intake plenum.

Design:

Direct fit, perfect OEM replacement
304SS sheet metal design, engineered to be simpler and cheaper than its formed OE counterpart
Reverse engineered with FARO laser scanning and Solidworks CAD technology

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Genuine European BMW - Corporate Logo
T#:383934
Part#: 21532282549
In Stock
$ 159.99 USD
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$ 159.99 USD
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This is required when installing a CSL airbox on an M3 with an SMG transmission. The expansion tank holds the hydraulic fluid for the SMG clutch cylinder.
MLR Engineering - Corporate Logo
T#:8645182
Part#: 10.102
Ships in 7 Business Days
$ 29.99 USD
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This temperature sensor is located on the block of the hydraulic unit and it measures the temperature of the hydraulic fluid.

Genuine BMW - Corporate Logo
T#:637266
Part#: S6S420G-SMGKT
Ships Jun 30, 2025
$ 281.99 USD
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$ 281.99 USD
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Have you noticed your BMW having trouble getting into gear? Refresh your BMW's entire shifter detent system with this all-in-one kit! Over time shifter springs can wear out, the locking pin and 8mm ball can become damaged, and excess play allows for the transmission to potentially come out of gear. By replacing the springs, locking pin, and plugs, this excess play is effectively eliminated, helping to keep your BMW in the proper gear!
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MLR Engineering - Corporate Logo
T#:8645192
Part#: 10.112
In Stock
$ 89.00
$ 82.99 USD
Limited Qty Sale
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$ 89.00
$ 82.99 USD
Limited Qty Sale
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Includes new seal, boot and lock ring to rebuild your SMG clutch actuator. Repair for OEM slave cylinder 21547507022, 23427507097
MLR Engineering - Corporate Logo
T#:15247143
Part#: 10.205X
In Stock
$ 155.00
$ 143.99 USD
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$ 155.00
$ 143.99 USD
Limited Qty Sale
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Full aluminum construction expansion tank used when relocating your SMG reservoir or installing a CSL type airbox.

This beautiful constructed custom aluminum expansion tank from MLR Engineering is designed for a remote location away from the intake manifold. Solving the issues of prone to failure plastic reservoirs, this will be the last reservoir you ever have to replace.

Moving the expansion tank away from the intake manifold solves space constraints, reduces overall hydraulic fluid temperature and/or reduces common degradation of plastics due to high temperature environments such as the engine bay.

Typical use cases of this product could also be:

When installing a CSL type airbox on an M3 with SMG transmission
Relocating the SMG pump

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MLR Engineering - Corporate Logo
T#:8645186
Part#: 10.109
Ships in 7 Business Days
$ 92.00 USD
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The pressure sensor is located on the block of the hydraulic unit and it measures the pressure of the hydraulic fluid. Due to the location of the sensor the instrument usually fails as a result of the excessively high ambient temperature within the engine bay, damaged pins from user installation and/or corrosion.
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MLR Engineering - Corporate Logo
T#:8645184
Part#: 10.107
Ships in 7 Business Days
$ 449.99 USD
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BMW E46 M3 SMG Pump Motor is a direct replacement for a worn or malfunctioning SMG pump motor. Designed to restore the performance of the SMG transmission system, this motor ensures smooth and reliable gear shifts.

  • Direct Replacement: Specifically designed for the BMW E46 M3, making it easy to replace a faulty SMG pump motor.
  • Complete Kit: Includes everything needed for installation, such as a high-torque DC motor, drive coupler, new installation screws, sealing gasket, and grease packet.
  • Enhanced Performance: Restores optimal function to the SMG transmission system, ensuring consistent gear changes.
  • 1-Year Warranty: Provides peace of mind with a one-year warranty covering defects and performance issues.
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MLR Engineering - Corporate Logo
T#:8645195
Part#: 10.290
Ships in 7 Business Days
$ 699.99 USD
$ 699.99 USD
Upgraded SMG tank with cooling fins and drain plug for easier serving of the SMG system. Kit contains, New aluminum oil pan New gasket/seal Mounting hardware

Genuine BMW - Corporate Logo
T#:50840
Part#: 23427571297
Ships in 1 day
Sale - Save 5% $ 871.99
$ 828.30 USD
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Sale - Save 5% $ 871.99
$ 828.30 USD
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A common fault with the SMG system, the hydraulic pump is the usual point of failure that prevents proper operation and gear shifts in your BMW.


Genuine BMW Repair Kit, Hydraulic Pump -
This item fits the following BMW Chassis:
E46,E63,E85

 

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Genuine BMW - Corporate Logo
T#:5388
Part#: 21532229715
Special Order: No Guaranteed ETA
Sale - Save 3% $ 5,774.51
$ 5,601.27 USD
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Sale - Save 3% $ 5,774.51
$ 5,601.27 USD
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This hydraulic unit includes the pump and pressure accumulator for the SMG transmission on E46 M3. It helps to maintain pressure in the system for proper shifting. A faulty unit can cause delays in shifting or a failure to engage any gears.

This item fits the following BMWs:
2001-2006 E46 BMW M3, M3 Convertible
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Genuine European BMW - Corporate Logo
T#:361538
Part#: 41147896136
In Stock
Sale - Save 39% $ 29.99
$ 18.29 USD
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Sale - Save 39% $ 29.99
$ 18.29 USD
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When you upgrade to the CSL intake, you have to replace and relocate the SMG reservoir. This bracket mount the new reservoir after the CSL conversion exactly as designed by BMW.


MLR Engineering - Corporate Logo
T#:28104809
Part#: 10.255.1
Ships in 7 Business Days
$ 175.00 USD
$ 175.00 USD

Upgrade your SMG system with the innovative MLR Engineering E46 M3 SMG Pump Relocation Bracket—a groundbreaking solution designed to boost performance and simplify maintenance.

This relocation bracket seamlessly moves the SMG II pump to the passenger side compartment, eliminating concerns about heat affecting pump performance in the engine bay.

Crafted with precision and engineered for excellence, these brackets utilize factory mounting positions on the pump for easy installation. With full rubber isolators and stainless steel hardware included, your pump is securely mounted and protected against vibrations and corrosion.

Enhance your driving experience with the E46 M3 SMG Pump Relocation Bracket—because optimizing every detail is crucial for top-notch performance.

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MLR Engineering - Corporate Logo
T#:8645198
Part#: 30.105
Ships in 7 Business Days
$ 599.99 USD
$ 599.99 USD
This is a direct replacement for your dead or tired SMG pump motor.
MLR Engineering - Corporate Logo
T#:8645191
Part#: 10.111
Ships in 7 Business Days
$ 103.99 USD
$ 103.99 USD
New Viton rubber inner SMG pump seals, ideal for replacing cracked and dried up OEM rubber seals. Kit Includes all seals in lower high pressure gear pump 2 inner pump gear seals 1 high pressure output o-ring 1 housing snout o-ring
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MLR Engineering - Corporate Logo
T#:8645193
Part#: 10.214
Ships in 7 Business Days
$ 299.99 USD
$ 299.99 USD
Viton rubber seals to replace your old worn out OE rubber seals. Kit includes Inner seals 16 Solenoid seals Reservoir seal Hardware

MLR Engineering - Corporate Logo
T#:8677192
Part#: 30.108
Ships in 7 Business Days
$ 799.99 USD
$ 799.99 USD
Custom designed SMG pump with a increased output for faster system priming and longer life then the factory pump.