2006 Impreza mod suggestions

I just bought my first Subaru Impreza!

It’s an 06 with 102,000 miles. It’s bone stock right now. If anyone could leave a link for some headers that would fit my car and maybe an exhaust I would greatly appreciate it. I’ve done some research on this and it seems like some of you might just be putting wrx parts on and with some modification. Would love to know more about it. Thank you!

Any suggestions and links are appreciated!

Thank you!