03 civic si questions

[3ep3steve]

Hey. Bought a 03 civic si about a year ago, Have put on dc shorty headers, hks hi power cat back, short shifter, and has a k&n short ram.also some aesthetics on the interior. Looking to add some more hp and wondering what else are pretty good bolt ons. Same as everyone else, i would like turbo, but im still not ok with dropping 3-4 grand. If I were to keep turbo in mind, what else would be a good route. I was thinking intake manifold, pulleys... any info is great. Stil pretty green around hardcore engine work but not shy and have a lot of hands on work. Still a daily driver so anything more than a weekend of work is hard.
thanks for any info.

eventually would like to post pics just need to take them.