u/Exciting-One4322

I have a 2008 manual 9-3 2.0T that I’ve installed a maptun stage 3 tune on with the full exhaust that the kit came with. Lately I’ve noticed that the car sometimes seems to not push the 19lbs of boost that it used to, and feels a bit sluggish overall. I’ve noticed that the boost needle does not push into the red at full boost and torque is definitely diminished. However there is no cel and the engine doesn’t stumble at all. I do not have a maptuner yet but I will probably get one to reflash the ecu but I’m curious if this is common and maybe there’s a simpler solution.