Description
If your Audi’s 3.0T or 4.0T is running hot under boost — or you’re planning a tune and want to protect your investment — this is the upgrade your cooling system needs. The MercRacing heat exchanger was designed from the ground up to solve what the OEM unit can’t: sustained, high-capacity cooling under real-world performance conditions.
Why This Heat Exchanger?
The factory Audi heat exchanger was engineered for stock power levels. The moment you add a tune, upgraded pulley, or push harder on the street or track, intake temps climb and power drops. Our design uses the full frontal area of the vehicle to maximize both surface area and coolant volume — the result is dramatically lower and more consistent intake air temperatures, even after repeated hard pulls.
Customers consistently rate this unit as offering the best overall performance, capacity, fitment, and value for the 3.0T and 4.0T platforms — outperforming most premium units in sustained heat rejection at roughly half the cost.
Key Features
- Multi-pass design with high-density fins
- Approximately 1-gallon coolant capacity — dramatically more than the OEM unit
- All-aluminum TIG-welded construction
- Crash bar mount with included brackets
- Integrated bleed port for easy air purging
- Drain holes on bottom header to prevent water accumulation
- Available in black powder coat or polished/raw aluminum finish
- Embossed MercRacing logo on top header
- Lower coolant pipe is movable to left or right side for easier fitment
What’s Included
- MercRacing Upgrade Heat Exchanger
- Mounting brackets and hardware
- Silicone hose(s) and clamps
Important Fitment Notes
- Vehicles with a factory dynamic steering cooler (visible through the top of the grille) will need to relocate this unit. We recommend adding our Compact Fluid Cooler to handle this.
Real Customer Results
“Huge upgrade over the stock unit. The difference in cooling is immediately noticeable — intake temps stay way more consistent, even after multiple hard pulls.”
“I’m an autobody technician and have seen many aftermarket radiators — this by far is one of the best. The welding is flawless.”
Installation – Information Resources
- Drive select, what to expect: https://youtu.be/qOpBNXkxeZ8?t=227
- B8 Install review by Vancity Audi: https://www.youtube.com/watch?v=80jnlqNax6Q
- A6 C7 Install: https://youtu.be/yiyz6q5FTVA
PLM power driven JHM CTS 034
CHRISTOPHER F. (verified owner) –
It was shipped fast and packaged very well. Build quality is good and kit includes all the necessary parts for install.
Anonymous (verified owner) –
Fire makes my car cool!
Glenn (verified owner) –
Absolutely amazing delivery time and perfect condition upon arrival. From America to the UK in just 4 days. Looks great on the car was as straightforward as it gets. Just make sure you follow the instructions when it comes to those Green O Rings, I crushed mine on one side, and had to use some Loctite to fix it. Will definitely be ordering stuff from Merc Racing again 🙂
Parker B. (verified owner) –
Very well crafted and came on time.
Curtis M. (verified owner) –
Fast shipping and communication would definitely do business with again
Jayden o. (verified owner) –
Fast delivery and in perfect condition