NO.
You can't even "maintain" any car for free... On the 86.5 NA I had, I installed some PaceSetter headers, and used an Unorthodox crank pulley and it "seemed" to do better. Best thing you can do is just start saving up for an eventual engine swap, if HP/performance is what you're after.... lots of choices these days... 7M-GTE, 1JZ, 2JZ, etc.
No matter what, there are no "free" performance upgrades for the NA. Good luck!