I have a 2015 Wrx with nothing done to it. It has 60000 miles on it. I was in 3rd then I rev matched it to 2nd dumping the clutch. While in the transition I heard a loud thump noise in the transmission area. The car still drives but makes weird noises when I drive the car. Also the clutch slips in all gears. Barely notice the slipping. Do I have a clutch problem or transmission? Thank you for your time reading and answers much appreciated.