Turbochargers

A turbo uses exhaust gas to spin a compressor, forcing more air into the engine so it can burn more fuel and make more power. Everything else in a turbo build exists to feed it air or keep it alive - oil, coolant, heat control and room to breathe.

PSI is a pressure reading of how hard the turbo is pushing air, not a promise of power on its own. The right figure depends on the engine, the fuel system and how much the rest of the truck can take - which is exactly the conversation worth having before you buy anything.

A smaller turbo spools quickly and feels strong around town. A bigger one makes more top-end power but needs rpm and airflow to get there. Twins and compound setups try to deliver both, which is why sizing follows the goal - never the other way around.

Air has to get in, get compressed, get cooled and get out again. Intake, compressor cover, intercooler and exhaust housing all change how quickly boost arrives and how hot it is when it does - and hot air is lost power.

Power that reaches the crank but never reaches the ground just breaks something else. Add boost and torque rises, and the transmission is the part that has to hold it. That is why the right order is turbo, tuning and transmission planned together - not bought one at a time and hoped for.