And also if have a 2001 2wd Silverado 1500 extended cab, is that something I match on the parts I take off? Such as another 2wd truck or is there a difference in the 2wd and 4wd applications? I also have a rack and pinion instead of steering gear box.

The hydroboost swap honestly isn't all that hard and well worth the effort in my opinion. Hardest part is pressing pulleys on/off the pump to swap it and even that really isn't that bad. My truck with all the upgrades I listed earlier weighs over 5200 lbs and will easily out brake my 89 trans ams factory 4 wheel disks lol.
As for the 2wd to 4wd parts interchanging all the brakes themselves, the power steering pump, and the booster assembly should all swap over. Only different thing I would think would be the power steering hoses themselves being different for rack vs box.
But I'm not 100% positive since I've never compared them myself.

I have the snap on set to pull of those pulleys, but all hydro boost systems I've seen have been with a gear box instead of a rack so I'll have to look into but I still should see a big increase in braking with the upgrade brakes and no hydro boost though right?

I would imagine you would

The brake lines would match too? I was thinking about getting steel beaded lines so I guess I will see. so I should get 2005 Silverado 1500 front calipers and Denali 2005 or a suburban rear calipers?

I don't know for certain if the brake lines themselves are the same but I imagine they would be. I ordered braided stainless for my truck and they went right on the calipers I swapped in.
Get the front calipers for a truck with rear drums. The 4 wheel disk trucks use the same calipers as the older ones.
As for the rears I got them for a 2005 4wd Tahoe. Never really researched or compared the different rear set ups so I can't really comment there

Do you have a part number or the link to the brake lines? I'll have to look into that

The PS pump does not have to be swapped or removed to do hydroboost install

Ah yes. He is correct. Forgot about that. You can just "T" the return lines as well.

As for part number on the hoses I don't remember. I just called summit and ordered them.

Ok I've read this and got on car-parts.com and im pretty sure i could do this conversation for way less then 400 bucks. Yes there used parts but come one there not something needing changed often. Considering the price i could replace them a couple times compared to buying new. And what's the chances? But im a cheap basterd!