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- USA
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Ships within 48 hours · Estimated delivery Jul 9 - Jul 14
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Description
CSF 99-03 BMW M5 (E39) / 95-03 BMW 540i M/T Radiator (Fits Auto Trans w/Modified Drain Plug)CSF has over 5 decades of experience manufacturing radiators. So when it comes to keeping your engine cool and your E39 M5 540i 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. This radiator features a 2
CSF has over 5 decades of experience manufacturing radiators. So when it comes to keeping your engine cool and your E39 M5/540i 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. 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 |
|---|---|---|---|
| 1995,1997-2003 | BMW | 540i | Base |
| 2000-2003 | BMW | M5 | Base |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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4.8 ★★★★★
Based on 557 reviews
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Product Reviews
★★★★★ 5
Perfect fit
Size: Large, Color: (100) White / White / Black
Durable and comfortable. Size works well. Very soft with nice thickness for training. Fairly long lasting
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Reviewed in the United States on February 12, 2026
★★★★★ 5
Post-COVID Sock Hunt: Finally a Win
Size: Medium, Color: (001) Black / Black / White
Ever since COVID, I haven’t been able to find a pair of socks that hold up for more than a few months. Brands like UA, Adidas, and others seem to have cut corners—likely in response to inflation—by downgrading materials and labor rather than raising prices. The result? Socks that wear thin, rip easily, or lose shape fast.
These, however, have been a pleasant surprise. I’ve been wearing them for a few weeks and so far, they’re holding strong. You can tell some cost-saving measures were still made—certain areas feel slightly thinner—but overall, the construction is solid.
A key win: they stay on. These are ankle socks (not “no-shows”), and they hug the ankle securely. That’s a huge plus in a world where most post-COVID no-shows slide off halfway through the day.
We may never get back to the pre-COVID quality standards without paying a premium, but for now, these are a reliable choice.
Ratings:
• No slipping: 10/10
• Price: 7/10
• Durability (so far): No pilling or loose threads — promising start.
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Reviewed in the United States on March 24, 2025
★★★★★ 5
Great Quality and Stylish
Size: Large, Color: (001) Black / Black / White
Exactly what I was looking for. I don’t like socks that are no-show that your ankles rub on the shoe. These are taller than that but shorter than socks that go up and over the ankle. They’re comfortable, good quality, and pretty thick. They’re form fitting m, but not compression. I dint like compression socks, and these are tight, but not too tight.
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Reviewed in the United States on June 5, 2025
★★★★★ 5
Affordable and good quality socks
Size: Medium, Color: (001) Black / Black / White
Good quality!
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Reviewed in the United States on May 9, 2026
★★★★★ 4
Socks
Size: Large, Color: (001) Black / Black / White
They are very comfortable and fit just right
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Reviewed in the United States on September 3, 2025