u/Fit_Engineering_5791

hey everyone, I'm returning after 15yrs. I want to rebuild my Karnivor with some AKA parts. My question for you is which part is necessary and what's not. I currently have a CP regulator and I want to replace that with their 2L reg but should I purchase their side winder high pressure reg?

in short, I'm adult now and have access to adult money, what's worth upgrading and whats not?