More power.
better efficiency.
Below are the results of the Caterpillar Performance DYNO test performed on a J-MAR Express 2005 Peterbilt C-15 CAT Engine. It shows an increase of 4 to 7 horsepower and a decrease in fuel consumption.

Performance Results
+7 HP
Peak horsepower gain
5/5
Load stages improved
Lower GPH
Reduced fuel rate in testing