This weekend while merging onto the freeway, I heard a somewhat loud hiss coming from the right side of my car as I left off of WOT in 3rd. It didnt sound like my typical BOV sound, it was louder than normal, not even sure if it was directly related, but it's the most prominent thing I noticed before the issue peeked its head in.
Not too long after that I noticed that I was only getting up to 15lbs of boost in sport mode and then it would die off and start dropping pretty quickly at the top end of 3k, and you can definitely feel the loss of power, even more so than the typical 5.5k~ power drop off. On top of that, I feel like it's spooling just a tad bit slower than usual. Before this I was consistently getting 20~lbs of boost. I'm aware that these gauges aren't exactly accurate, but either way, the gauge would build up to 20lbs basically all the time and die off from there. Oddly enough I already had an FMIC on the way so I guess that's a good thing, and after this issue, I bought some new vacuum lines hoping that might alleviate something as well, but mainly posting here for any suggestions to keep an eye out for, things to check/double check. Just as a side note, both the Spark plugs and Coil packs were changed about 2 months ago. Any tips would be helpful, so I can double check everything while I have the front end dismantled for the IC install. Also, there has been no CEL at all.
Video for reference: