★★★★★ 5
Great fit
Perfect fit. FYI - I bought the exact same one on EBAY FOR $11.78
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Reviewed in the United States on May 2, 2026
BorgWarner Turbocharger SX K04 Audi RS4 Upgrade (Left)
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
BorgWarner Turbocharger SX K04 Audi RS4 Upgrade (Left)SKU: 53049880025 UPC: 4063984007249 BorgWarner Turbocharger SX K04 Audi RS4 Upgrade (Left) 2000 2002 The BorgWarner SX K04 Turbocharger serves as a left side upgrade for the twin turbo 2. 7L engine in 2000 2002 Audi RS4 models. This direct bolt on replacement delivers higher boost levels with faster spool up compared to stock K04 turbos. Pair it with the matching right side unit for balanced power gains up to 500+ horsepower. Key Features Billet
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- Fast: 2-3 business days
- Express: 1-2 business days
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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.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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4.2 ★★★★★
Based on 1892 reviews
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Product Reviews
★★★★★ 5
East
Easy to replace and great fit
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Reviewed in the United States on January 4, 2026
★★★★★ 5
Perfect fit
Nice quality
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Reviewed in the United States on May 10, 2025
★★★★★ 5
Good OEM replacement for Honda Pilot
Size: 7.5" x 8.7" x 1.4"
Simple cabin filter for my wife’s Honda Pilot. It fits well in the cabin air filter drawer. This is of similar quality to the original Honda one; just cheaper. I’ve bought this for my Subaru and have been happy with it as well.
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Reviewed in the United States on April 9, 2026
★★★★★ 5
Works great!
Size: 7.5" x 8.7" x 1.4"
This is a great filter for allergies and a huge help during allergy season. It traps fine dust and pollen much better than the standard paper filters you get from the dealership, resulting in noticeably cleaner air inside the cabin. The construction feels very solid, and it fit perfectly right into the housing without any issues. If you are looking for true HEPA filtration in your vehicle, this is definitely worth the upgrade!
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Reviewed in the United States on March 13, 2026
