LOL, can we help this guy instead of: "It's a boost thing, you wouldn't understand."
Why certainly.
"Boost" is a cute racer term that means air pressure above that of barometric. It is actually a measure of a restriction in the path of airflow. Typically the only restriction you want to be in the path of airflow is your engine. However if you replace your charge pipe (the pipe after the turbo) with a drinking straw, you will have a huge restriction and make a ton of boost (but no power.)
It's been discussed on this forum before that people with Trifecta tunes (in the days before HPTuners) will get other mods like intakes and exhausts or manifold ports and see their max boost numbers drop and not understand why. The reason is because there is now less restriction in the system and so the same airflow can be obtained while measuring less boost.
Many people do not understand the difference between boost and airflow. Airflow is a function of volume. In order to make power over time you need some amount of airflow. If your engine flows 100 CFM (cubic feet per minute) of air to make 200 horsepower while measuring boost at 10 psi, and then you get a bunch of mods to make it flow better, you can flow 100 CFM to make 200 horsepower at 8 psi.
The point of this is that boost does not make power... airflow does! So since our cars are programmed for some specific output torque and you make the system more efficient it will continue to make that same output torque with less boost (but same airflow, unless your mods are making the engine internals more efficient.)
TL;DR it's a boost thang baby
