I had some weird **** happen to me while I was on my way to get dinner earlier tonight. I was getting off the off ramp and decided to drop it to 3rd gear as I was going about 45-50mph boost started building rpms starting building.. Then all of the sudden the boost stopped building at 4500rpm and dropped drastically as I pulled into the parking lot I noticed my exhaust was A LOT louder than normal like REALLY loud. The exhaust is only REALLY loud from the get go. then calms down under normal driving. And after the boost stopped building at 4500rpm now I am not able to boost at all. I can give it WOT and the boost gauge will not pass 0 it stays in vacuum all the time. After eating dinner I popped the hood took a quick look at all visible boost lines they all seemed to be in tact. BPV boost lines were fine and so were the boost lines by the actuator. But what is really stumbling me is the exhaust is extremely loud now like robins car not even exaggerating. So it would lead me to believe a exhaust leak but why would I lose boost with a exhaust leak? Any help please.. thanks.