SKU: 70705196578

CSF 00-06 BMW M3 (E46) Triple Pass Radiator

Sale price$266.91 Regular price$296.57
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Ships within 48 hours · Estimated delivery Jul 18 - Jul 23

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Description

CSF 00-06 BMW M3 (E46) Triple Pass RadiatorCSF has over 5 decades of experience manufacturing radiators. So when it comes to keeping your engine cool and your E46 M3 running at its best, a CSF High Performance All Aluminum Radiator is the obvious choice. Designed to perform on the street or at the track, a performance radiator is a must have for both high horsepower builds as well as race vehicles which need added cooling performance in motorsports environments. The Triple Pass Flow Structure

CSF has over 5 decades of experience manufacturing radiators. So when it comes to keeping your engine cool and your E46 M3 running at its best, a CSF High-Performance All-Aluminum Radiator is the obvious choice. Designed to perform on the street or at the track, a performance radiator is a must-have for both high horsepower builds as well as race vehicles which need added cooling performance in motorsports environments. The Triple-Pass Flow Structure allows the coolant to flow across the core of the radiator three times before exiting for lowest outlet temperatures possible. This radiator features a 2-Row core with CSF's exclusive B-Tube Technology: Unlike a regular oval shape "O" type radiator tube, CSF uses a specially engineered tube in the shape of a "B". These "B-tubes" are carefully formed and then brazed over the seam to seal. CSF is able to use thinner and lighter aluminum material (with better cooling efficiency) because this design is actually stronger than normal "O" shape tubes that are welded. The design (inlet in the middle of the tube that is seam brazed) increases the heat transfer surface area of the tubes by approximately 15% over regular tubes - producing the efficiency of two smaller tubes vs. one large tube within the same space criteria. With "B-tubes" you are able to get "dual liquid laminar flow". CSF also uses ultra efficient multi louvered fins that are carefully and precisely aligned to maximize airflow through each radiator core. Fin specifications are carefully measured and calculated for each application, and tested for maximum heat rejection efficiency in our wind-tunnel lab.

This Part Fits:

Year Make Model Submodel
2001-2006 BMW M3 Base
Shipping Notes
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 70705196578

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Payton
Bozeman, US
★★★★★ 5
Perfect for whatever activity!
Size: Large, Color: B004
I bought these specifically for my postpartum journey, and I still wear them. They are so comfy & a perfect length.
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Reviewed in the United States on April 16, 2026
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Swetha Puchakayala
Draper, US
★★★★★ 5
Worth Spending
Size: X-Large, Color: B004
Super comfortable....
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Reviewed in the United States on May 26, 2026
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Terrie
West Palm Beach, US
★★★★★ 5
Warm and comfy thermal wear
Size: Small, Color: Navy
They are very soft, don't ride up. Clothes do not stick to them like other thermals do. The fit is perfect. They are warm and comfy. The quality is good, too.
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Reviewed in the United States on January 23, 2026
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AmazonCustomer
Phoenix, US
★★★★★ 5
Comfortable, well made, washes well, would buy again
Size: Medium, Color: Light Grey
I bought these as a gift for my friend who lives in cold country and she says she loves them and they wash-and-wear well and are well made. Also very warm. Very comfortable and the fit is right on size. I would order them again
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Reviewed in the United States on January 21, 2026
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wyo5
Chelsea, US
★★★★★ 5
Perfect
Size: Large, Color: Navy
Oooooo these are so nice and soft and so warm! I am a nurse and work in an old hospital that is getting remodeled and there have been days we haven’t had heat and I have been very happy that I purchased these. My scrubs glide very nicely over these and don’t add any bulk. Definitely worth every penny! The fit is spot on and they wash up really well.
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Reviewed in the United States on December 12, 2025

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