I can't see getting more than the claimed 10-15 from the whole combo, maybe a little bit more. I've run everything listed except the cam and had noticable, but not great, gains. Header, 2.5" all the way back, free flow muffler and no cat. It helped, just not a ton.
If you're going with a big cam on a 22re you're kinda looking for trouble. You'll have to remap the injection and possibly go with larger injectors to keep up with all the mods.
