Heat is the enemy of performance. Keep temps down and performance will go up as a result of increased efficiency. It's really as simple as that. 

In stock trim, testing made it painfully obviously that cooling was going to hold an even more vital role on the F8x platform to achieve maximum results. The stock cooling system heat soaks after only 3 pulls and allows the engine air intake temperatures (IAT) to rise dangerously. The ECU must then reduce engine power to prevent detonation. With the Dinan high performance heat exchanger the vehicle does not heat soak even after 7 pulls; more than twice the effectiveness of a stock setup! 

Some may ask why change the heat exchanger and not the intercooler itself? Wouldn't it be more beneficial to go directly to the source of the charge air? The simple answer is yes, but at a cost. The stock system cools the intake charge by using a water-to-air intercooler, an expensive piece to engineer. The cooling circuit for the water that feeds the intercooler uses a primary cooler (heat exchanger) and a smaller secondary cooler in front of the passenger side wheel. Through rigorous testing of all 3 of those components and multiple combinations therein it was discovered that the most effective performance per dollar solution was replacing the heat exchanger with a larger unit. 

Further testing focused on the heat exchanger produced the optimized design you see before you. With 60% more volume and 19% more face area than stock along with being a whopping 40mm thick (24mm thick stock) it becomes quickly apparent how heat soak is averted with the improved setup. While the unit could be physically thicker the 40mm dimension was ultimately chosen with consideration of airflow requirements of the main radiator which is located directly behind the heat exchanger. A thicker core would diminish airflow and sacrifice normal engine cooling which would be potentially detrimental to the long term health of the engine. The increased physical stature of the heat exchanger allows reduction in water temperatures to the intercooler an average of 9° across the RPM range. The colder water entering the intercooler then improves is efficiency and allows the intake air to be cooled by an additional 6° average across the RPM range compared to the stock unit. The reduction in intake air results in an impressive +10 HP and +20 ft-lb of torque gain without any changes in the engine tune. The cooling unlocks some significant additional power when paired with the stage 3 DINANTRONICS Performance Tuner. 

Benefits of the Dinan High Performance Heat Exchanger for the F8x M3/M4:

+ Consistent +10 HP / +20 ft-lb of torque on the stock engine tune. Additional gains realized when used in conjunction with the Stage 3 DINANTRONICS Performance Tuner. 
+ 60% more core volume & 19% more face area than stock
+ 40mm thick Dinan cooler vs. 24mm thick stock cooler
+ 9° average water termperature reduction to the intercooler across the RPM range. Colder water improves intercooler efficiency and allows the intake air to be cooled by an additional 6° average across the RPM range compared to stock. 
+ Significant reduction in tendency to heat soak
+ Rubber mounted for vibration isolation
+ Track tested to ensure consistent performance under extreme conditions

A Premiere BMW Tuner

Founded in 1979, Dinan is well established as North America’s premiere BMW tuner. Dinan develops, manufactures and markets a comprehensive line of high performance products and systems, distributed through a nationwide network of Authorized Dinan BMW Performance Centers that includes select BMW Dealerships and Independent BMW Service/High Performance facilities.

Dinan’s industry leading warranty program, quality products and solid engineering have helped to make Dinan an almost household word among BMW driving enthusiasts. Road tests conducted by major automotive enthusiast publications over the last 30 years place Dinan enhanced BMWs on a performance level with some of the most exotic sports cars in the world. At the same time, Dinan BMWs are widely renowned for being civilized and reliable, providing a high performance BMW-like driving experience without equal.

Dinan’s comprehensive warranty program, introduced in 1996 with the cooperation of BMW of North America, provides BMW owners with matching coverage to that offered by BMW’s new car warranty, ensuring that Dinan performance enhancements and the BMW they have been installed in are covered for up to 4 years or 50,000 miles. BMW automobiles can now be performance-tuned without the associated concern of negatively affecting the new car warranty coverage, making the idea of enhanced driving fun and excitement appealing to a rapidly growing number of BMW drivers. In addition, Dinan Certified Pre-Owned high performance BMWs are now available through participating Dinan Authorized BMW Dealerships, offering matching warranty coverage to BMW's program.

Dinan is also now expanding its offerings to include the popular MINI models, providing the same attention to detail, solid engineering, warranty and performance that have made Dinan widely regarded as the top BMW tuner in North America.

Dinan offers a broad range of BMW performance products from engine, driveline and chassis tuning components to complete Dinan Signature Vehicles and special Factory Works programs. As a serious BMW Tuner, Dinan's objective is to offer complete performance solutions for the entire range of BMW models. We believe that every BMW driver deserves the opportunity to get the most from their car. From faster acceleration to improved cornering capabilites and stopping power, Dinan takes the guess-work out of creating the high performance BMW of the enthusiasts dreams with compete, balanced performance systems.