I just recently got an upper end knock in my ej22. So I pulled the engine to rebuild it. That being said I dont want to walk away from this build with the same amount of hp. I did some research and I found cams for like 500 but idk if that will be a decent upgrade. I also dont know what I need to mod to put cams in. I have forged pistons and forged internals. Are there any other economical mods I can do? Also would the cams be the way to go? The ej22 is an aftermarket block I got in 12 it was a small upgrade but I didnt want to go with a 2.5 because Im still running a stock wrx manual trans.