A diesel engine is essentially an air pump. Any restrictions in the incoming air charge and its not able to act as efficiently as it could otherwise. On your 6.7L Powerstroke, the factory air to water intercooler is the largest restriction in the system, slowing air velocity substantially. Upgrading to this replacement from No Limit will substantially reduce this restriction.This 6.7 Powerstroke Intercooler will add throttle response, drop EGT's (Exhaust Gas Temperature), decrease spool-up time, and add low end power and torque. Overall, these intercoolers will make the driving experience better! With testing by an independent source, this intercooler has shown cruising and peak EGT drop of 50-100 degrees, coupled with a substantial change in driving characteristics. Available in stage 1 or for massive gains the stage 2 to get the most out of your powerstroke.