over the weekend i installed my tst comp, and its like a different truck. i bought it used, so it didn't come with a boost elbow. i was expecting to not make much boost, but if i get on it hard, i can pin the 30 psi gauge i have, regardless of what i have the box set on. im thinking its a stuck wastegate, but im not sure. does that sound resonable? it also makes a loud bang from the exhaust when i shift. any ideas?? thanks in advance

 

how do you diagnose and fix a stuck wastegate? I can hit 30 psi with the mods in my sig, and a stock, or closed boost elbow, and I wondered if it was wastegate related.