Hi Everyone - I installed and have been using the nameless 5” quad exhaust on my 2021 Impreza base hatch. I am noticing that 2.5-3.5k rpm has a ton of mid pipe vibration. It vibrates through the cabin and definitely hurts everyone’s ears in the car. I have checked for leaks on the axle back and haven’t noticed anything. I also don’t notice the exhaust rubbing on the frame. Please let me know if you have any thoughts and suggestions to narrow this down. My next thought it to check if the resonator is working properly! I also want to note that I love the sound coming out the back, it’s just sounds terrible if I stick my head about halfway under the car.