i need peoples opionions on my next modification. Ive been doin alot of research and im either going to add cams or a header

now heres my question is there a big difference in power with an aftermarket header everyone swears by them but im wondering if cams would be better first.

looking to buy toda spec a cams or ITR or CTR cams o ya and if yall say header first wats a good brand. And no dc sports everyone and their mother has dc