Increase your cooling capacity for better performance
This heat exchanger upgrade is a high-quality replacement that dramatically lowers engine oil and water temperatures by providing a 50% larger cooling surface than OEM. The benefits are most noticed during back to back runs at higher boost levels where the factory cooling capacity can be overwhelmed resulting in ignition timing pull and reduced turbo efficiency. Direct bolt-in installation. 
Replaces OEM part #17118666811 and 16400-WAA03