Yes, it's substantial. My tune progress is a little weird, but with just a HPFP on pump you can expect to carry at least 28psi all the way to redline, and it just keeps it right through the shift. In the end, mine
should be a little more than that since I did both HPFP/LPFP (and currently working through issues), but the version of the tune I'm on is essentially the power level of just a HPFP.
I'm on stock PCV and stock mounts, right now with no plans to upgrade either. I do have bigger brakes (the Macan Brembos), but don't see any reason why they would be necessary for regular street driving. If you're tracking the car, then there's definitely a benefit from the bigger brakes. I got them because they look dope.
I think for a street driven car, at both a performance and cost level, a vortex with a HPFP and custom tune is a good place to be. $3,000 down, and some good power. My own disdain for my current build is I'm nearing double that with nothing extra to show for it
Obviously that changes if you have different goals like big HP, creating a track monster, etc...