5efe N/A Boosts

Okay i've been thinking a lot what i'd do when my engine blows up (320k km), though it's in good condition still. I was thinking if i should turbo it or rebuild it, now i've decided a rebuild because turbo is just too complicated for me and i don't really trust the mechanics around my area, since thye dont specialize in tuning and stuff. Anyways what stock car can my Paseo beat with

Muffler
Headers
SRI
Lightweight Underdrive Pulley
Nology HotWires
Royal Purple Oil
What N/A boosts can i add more? to make it faster

Also any advantages of having a N/A Engine?

Thanks