So i got a dyno run today, finally, and the car only made 158rwkw as opposed to it's 190rwkw before i got rear ended. All that was changed after i got hit was my exhaust from the cat to the muffler, I got a better muffler this time a stainless steel magnaflow. They guy who I took it to was very helpful and said that the cat itself could be damaged which could be causing the drop in power or just that the timing is out and I need to get it re-tuned. I'm gonna try and get a re tune in the next 1-2 weeks hopefully. The funny thing is the car drives very nicely. no popping sounds, it starts up perfectly in the morning, it's just the drop in power for some reason, also there no missfires or anything like that.