The Exhaust Gas Recirculation (EGR) system is designed to reduce nitrogen oxide (NOx) emissions by partially redirecting exhaust gases back into the intake manifold. This lowers the oxygen concentration in the air-fuel mixture, which in turn reduces NOx formation. However, this process may lead to a decrease in engine power.
Removing the EGR system increases NOx levels but significantly reduces soot, hydrocarbons, carbon monoxide, and carbon dioxide emissions. Additionally, eliminating EGR can improve fuel efficiency.
In BMW engines, the presence of EGR accelerates engine oil oxidation, which negatively affects engine condition.
EGR Removal Procedure:
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Remove the EGR cooler and the EGR valve.
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Block off the exhaust gas channel in the exhaust manifold and the cooler.
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Install the diffuser pipe.
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After mechanical removal, it is recommended (but not required) to disable EGR via ECU software.
BMW Part Numbers Replaced:
11717785452, 11714701242, 11717785789, 11717785794, 11712248717, 11712354070, 11717804378, and Pierburg 7.28264.06.0.
How to Select the Correct Kit:
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Open the hood and visually compare the parts with the photos on the website.
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Use an online parts catalog and your vehicle’s VIN for verification.
- Before ordering, be sure to check the length of your flange. It should be 98 mm, as shown in the 4th photo.
Compatible BMW Engines:
M47, M47N, M57, M47N2, M57N.
The diffuser is designed to be installed in place of the EGR valve (with hose clamp connection).
Vehicle Compatibility
3' E46 (1997–2003)
318d Sedan – M47
318d Touring – M47
318d Sedan – M47N
318d Touring – M47N
318td Compact – M47N
320Cd Convertible – M47N
320Cd Coupe – M47N
320d Sedan – M47N
320d Touring – M47N
320td Compact – M47N
330Cd Coupe – M57N
330d Sedan (up to 08/2000) – M57
330d Touring – M57
330d Sedan – M57N
330d Touring – M57N
330xd Sedan – M57
330xd Touring – M57
330xd Sedan – M57N
330xd Touring – M57N
5' E39 (up to 08/2000)
525d Sedan – M57
525d Touring – M57
530d Sedan – M57
530d Touring – M57
7' E38 (up to 03/2000)
730d Sedan – M57
X5 E53 (1999–2003)
3.0d – M57
3.0d – M57N
7' E65 (2001–2005)
730d Sedan – M57N
X3 E83 (2003–2006)
2.0d – M47N2
X3 E83 LCI (2006–2007)
2.0d – M47N2
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