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Ships within 48 hours · Estimated delivery Jul 19 - Jul 24
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Description
APR Air-To-Water Intercooler System - Audi / B9 / 2.9T / RS4 / RS5The APR Air to Water Intercooler System for the B9 RS4 RS5 2. 9T EA839 offers a substantial leap in performance that directly translates to more horsepower and torque, and consistent performance that's unmatched by the factory cooler. The factory cooler struggles to cool the charged air resulting in excessive intake air temperature due to its small size. This struggle results in ECU protecting the engine by pulling power during a single quarter mile
The APR Air-to-Water Intercooler System for the B9 RS4 / RS5 2.9T EA839 offers a substantial leap in performance that directly translates to more horsepower and torque, and consistent performance that's unmatched by the factory cooler. The factory cooler struggles to cool the charged air resulting in excessive intake air temperature due to its small size. This struggle results in ECU protecting the engine by pulling power during a single quarter mile pass, lap around a track, or even during a spirited drive. Simply bolting on the APR System relieves this issue, resulting in an instant boost in power and consistency. The APR system has no trouble remaining consistent thanks to its ability to resist power-robbing heatsoak!
Features:
- 194% larger than the factory intercooler
- 5,500cm³ vs the undersized 1,870cm³ factory unit
- Dramatically lowers intake air temperature
- Consistently more horsepower and torque
- Flows more than stock at every measured pressure differential
- CFD optimized cast aluminum end tanks
- Proprietary aluminum cooling core
- CNC machined and tig welded construction
- Application specific coolant hoses
- Application specific ez-flow charge air hoses
- CNC bent and laser cut brackets
- Does not negatively impact emissions
- Does not require tuning
- Instructions and support included
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
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
4.4 ★★★★★
Based on 26 reviews
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Product Reviews
★★★★★ 5
Great running hat.
Size: One Size, Color: (001) Black / Black / Reflective
I absolutely love this hat, it is so cute and great for warm weather. I especially love to run with it, you can tighten it easily so it does not blow off if it is windy.
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Reviewed in the United States on August 17, 2025
★★★★★ 4
Thin and flimsy
Size: One Size, Color: (001) Black / Black / Reflective
Very flimsy hat
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Reviewed in the United States on April 18, 2026
★★★★★ 5
Worth the prize
Size: One Size, Color: (001) Black / Black / Reflective
Light and breathable.
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Reviewed in the United States on April 14, 2026
★★★★★ 5
Perfect for running, I love this hat.
Size: One Size, Color: (025) Castlerock / Castlerock / Reflective
This hat is perfect for running in, it's very light weight and breathable so it doesn't get annoying or hot when you're running in the sun. It's easy to clean, just a quick hand wash in the sink and it's dry in 30 minutes. I have a very big head and it's fits me great. If you have a very small head it might be a bit big.
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Reviewed in the United States on April 23, 2025
★★★★★ 5
Perfect hat to buy
Size: One Size, Color: (001) Black / Black / Reflective
Perfect fit. Will buy again.
Easily washable. Color doesn’t fade after washing. Perfect for sun protection.
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Reviewed in the United States on September 5, 2025