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MAHLE BEHR Intercooler - CI 421 000S

Mahle Behr Intercooler Ci 421 000 S

MAHLE BEHR
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UGC CI 421 000S
$122.89 - $122.89
$122.89
$122.89 - $122.89
$122.89
CALIFORNIA WARNING

Handling passenger or off-highway motor vehicle parts can expose you to chemicals such as phthalates and lead, which can cause cancer and reproductive harm. To minimize exposure, service the vehicle in a well-ventilated area, wear gloves, and wash your hands. For more information see www.P65Warnings.ca.gov/motor-vehicle-parts.

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MAHLE BEHR

Intercooler

This product also goes by these part numbers: 8E0 145 806 M, 8E0145806M, CI 421 000S, CI421000S

This part also goes by the following cross reference.

Cross Reference Part Number: 8E0145806M

Fits These Vehicles 11 applications
B7 A4
Make Model Engine Years
AUDI A4 B7 (8EC) 2.0 TFSI 2004–2008
AUDI A4 B7 (8EC) 2.0 TFSI quattro 2004–2008
AUDI A4 B7 (8EC) 2.0 TFSI 2005–2008
AUDI A4 B7 (8EC) 2.0 TFSI quattro 2005–2008
AUDI A4 B7 (8EC) 2.0 TFSI 2006–2008
A4
Make Model Engine Years
AUDI A4 B7 Avant (8ED) 2.0 TFSI 2004–2008
AUDI A4 B7 Avant (8ED) 2.0 TFSI quattro 2004–2008
AUDI A4 B7 Avant (8ED) 2.0 TFSI 2005–2008
AUDI A4 B7 Avant (8ED) 2.0 TFSI quattro 2005–2008
AUDI A4 B7 Avant (8ED) 2.0 TFSI 2006–2008
AUDI A4 B7 Convertible (8HE) 2.0 TFSI 16V 2006–2009

Fitment data last updated: 2026-05-15

Fits 11 vehicle applications Check vehicle fitment before ordering View fitment

About this Intercooler

The MAHLE BEHR CI 421 000S intercooler cools the air coming out of the turbocharger or supercharger before it enters the engine. Cooler air is denser, which helps performance and consistency, especially under repeated hard driving.

Frequently asked questions

What does an intercooler do?

Compressing air heats it up. The intercooler removes some of that heat, so the engine gets denser, cooler air, which reduces the risk of knock and helps the engine keep making power.

What are the benefits of an upgraded intercooler?

A larger or more efficient core keeps intake temperatures lower during repeated pulls or hot weather, reducing heat soak. The gain matters most on tuned engines running more boost than stock.

What are the signs of a leaking intercooler?

Loss of power, boost-related fault codes, oil residue on the intercooler or its hoses, or a hissing sound under boost. A boost leak test will confirm it.

Does an intercooler upgrade need a tune?

Most bolt-on intercoolers work without a tune, and they often complement one. Check the product details for fitment notes, such as bumper trimming or relocated parts.

How do I make sure this intercooler fits my car?

Compare the part numbers listed on this page with the number on your old part or in your vehicle's parts catalog, and check the fitment information. If you are unsure, contact us with your VIN before ordering.

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