BurbMan wrote:
OEM tuning is a compromise of power, economy, and durability/longevity. Increase any of those 3 points and you will have an adverse affect on the other two. No free lunch...the OEM engineers know what the weak links are in the drivetrain when they design and test the vehicle, you likely won't find out until they fail.
OEM tuning also takes into account the lowest common denominator of poor driving habits, negligent maintenance and cheap, low quality cornerstore gasoline. Remove all those and a competent tuner can increase drivability and towing performance