Hi there. I could use some help. So after some research, I think I settled on RRM's headers. And either SRS's catback exhaust or Magnaflow's. But I don't understand how or what high flow cat I can buy that will work and fit right. Or will there be labor involved no matter what one I buy in order to make it all fit? If anyone has any suggestions or can share their own setup and troubleshooting, I would greatly appreciate it.

I have a 2009 Lancer GTS - Fed model.