So far i have a 180* T-stat and ZZP 1.0 PCM.

What should be next? What would give me the best power gain thats under 300$

I was thinking a high flow cat and downpipe. Or should i go with a power log and ported manifold? I do not want to put a smaller pulley on because im skeptical about them and want my car to have 0 knock retard, so i never run the chance of chipping a piston.

So a downpipe or ported manifol and power log, or is there something better?

A ported manifold or Plog will be the best choice. The front manifold is the most restricted part right now. In the end it'* all a package, Plog, down pipe, free flow cat. You could look at having a MPS pulley installed and running a 3.6" pulley and also getting a aeroforce scan gauge. Those together woudl be around $300 or so if you find a good deal on a used set.

i talked to a guy at ZZP and he said the downpipe, high flow cat, and installation would be around 300$ so i guess it just comes down to what i wanna do first.