Wastegate is usually use to regular boost for turbo system.... I’m actually running a supercharger... which doesn’t use wastegate to regular boost. BUTTTT I’m running an aftermarket 3.5” cat and planning to up my power to about 750-800HP.... and 3.5” exhaust is too restrictive in my opinion for that power level... let alone the cat... it’ll be soooo restrictive with the cat. Soooooo I added a wastegate to relieve exhaust pressure right before the cat. The boost (on the gauge which is tapped into the intake runner) goes down because it’s more free flowing. The easier the exhaust move, the less pressure will be in the intake side. But that doesn’t mean I’m losing HP... if anything I’m making more power. It’s like adding a better flowing cam. Swapping a cam out will definitely drop my boost shown on the gauge. But without swapping my pullies, I will probably make another 50-75HP with boost gauge showing 2-4 PSI less. Hope that clears it up. I know I’m not the best at explaining things. Sometime I even confuse people more haha. Sent from my iPhone using Tapatalk