D17A1 proformance parts

[Jonboy92]

Hey I'm new to the Honda world but grew up around a lot of different Honda's feel in love with the atmosphere and finally got me one. But I got the non VTec it was a steal it's been rebuilt it's a 5 speed it's been taken care of really well maintenance kept up really well. I've added a cold air intake and high proformance coils and plugs. I'm wondering what to do next I wanna do headers and full exhaust. I can't find proformance headers. There all stock with the catalytic converter attached. What's a good website for older Honda proformance parts. I need help. Lol and I'm gonna get coil overs soon to make it hug the ground and curves better. But it's my everyday driver so I can't really tear it apart like I'd like to. So what are some things to do to a non VTEC Civic LX that would help it make more power and run faster and smoother and where can I find these parts