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Air and Fuel› Air and Fuel Cooling Systems and Components

Merc Racing

Heat Exchanger

Name: Heat Exchanger
Brand: Merc Racing
SKU: MR6HE

$639.95

SKU: MR6HE

Free Shipping over $200

$100 Minimum Order

30 Days Return

DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Merc Racing MR6HE is a high coolant capacity heat exchanger designed for Audi's air-to-water-cooled turbo and supercharged applications. It offers expanded cooling system capabilities and higher water volume compared to other products on the market. This heat exchanger features a unique, patented design that utilizes the entire area of compatible Audi vehicles to provide excellent cooling.

Show original supplier description

The Merc Racing MR6HE is a high coolant capacity, one-gallon water volume heat exchanger engineered to address the advanced cooling needs of Audi's air-to-water-cooled turbo and supercharged applications. This unit expands upon the factory cooling system, offering superior performance for stock, upgraded, or higher boost tuned applications. Its patented design maximizes the use of available space to ensure excellent cooling capacity and delivers amazing results. Constructed from all-aluminum with hand TIG welded components, the MR6HE features a high-density fin core for exceptional heat dissipation. The end tanks are finished with a durable black satin/matte coating, providing resistance to road debris, corrosion, and easy cleaning. It includes a 1/4″ NPT bleed port to aid in air removal during installation and utilizes 3/4″ tubes for efficient coolant flow. The overall dimensions are W 24″ x H 18″ x D 2.4″ (excluding side tubes). This heat exchanger is compatible with a range of Audi models including the S6, S7, A7, A6, Q5, SQ5, S4, and S5. Mounting hardware, including side mounting brackets and bolts for crash bar installation, along with self-tapping screws, are included for a straightforward installation process.

Vehicle Symptoms

Engine power drops after repeated hard acceleration
High intake air temperatures on datalogger
Heat soak during track sessions or spirited driving
Coolant system unable to keep Charge Air Cooler temps down

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Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

Brand	Merc Racing
Part Number	MR6HE
Category	Air and Fuel

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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