I got the pagparts 450 setup for mine, and it dropped in with stock controller and no modifications to lines or anything and customer service was great, but my experience with most cars is that once you start getting into modifying the fuel system the reliability goes way down and headaches go way up. If I was doing again I'd just go with HPFP and run that as hard as it would take and be happy but no idea how that would work with an XL vortex turbo.
some turbo inlet for sure. for a turbo that big I would personally go with an EQT piping kit as well since you have it all apart anyway.
upgraded motor mounts at that power level are pretty important too. the stock motor mounts will get wrecked almost immediately if they aren't already worn out.
I did a ton of research on intecoolers and everyone has their own thoughts, but I ended up going with APR if that shows you what I think.
and some good brake pads and fluid LOL. >500hp in a 3,100lb car gets exciting quick on the street haha