We've said it before, and we'll say it again, the key to a properly running diesel is to shove as much cool, dense air into the engine as it will take (within reason, of course). And that's why running an aftermarket performance intercooler can be so advantageous, especially after tuning and bigger injectors are installed. These things are great for delivering more horsepower through additional fueling, advanced timing, engine mapping, etc., but it's still not getting that much additional airflow into the engine. A performance intercooler has the ability of collecting significantly more air and condensing it compared to the wimpy stock unit.

Mishimoto has released a performance aluminum intercooler for the 2001-2005 Duramax built to maximize the efficiency of your Duramax. The Mishimoto Duramax intercooler is built to last, with heavy-duty cast aluminum end tanks and a bar-and-plate core, allowing for increased airflow and cooler intake temperatures. The Mishimoto Duramax intercooler features a significantly larger core than the factory unit and is designed to support substantial boost pressures and lower EGTs, both highly advantageous on your stock or modified 6.6L. Offered in black or silver, the Mishimoto 6.6L Duramax intercooler is protected by the Mishimoto signature lifetime warranty.