I have a 99 Saab 93 B204L and I just got a stage 2 Tune done off a tuner I met online. Finally get the ecu today and I’m making the same boost I was stock. He says that my bypass valve or apc valve may be bad or I just have really bad vacuum leaks. Whatever the case maybe I’m concerned. I have the same power and I’m 225 into a ecu that’s no difference. Dont exactly know if that kind of stuff could even cause it. He said t5 cars care a lot about vacuum if anyone could provide some insight or something that would be great.