I have a 2017 Mazda3 2.5L. For the past 6 months or so ive been experiencing abnormal vibration through steering wheel/pedals/footwell under acceleration. It seems to be worse in the morning or when the temp is lower. Its less noticeable over 25 degrees Celsius. I also feel like im getting more noise coming out of the engine bay at the same time. I had 2 Mazda techs test drive it a couple months ago, and they said they detected nothing.. Any ideas? My thoughts were maybe a defective weld somewhere along the exhaust, or a messed up motor or transmission mount?

Vibration on Acceleration