After you weld your brackets on, this is what they should look like. | 
Weld your bottom bracket into place and bolt your 'bag in. You are now ready to put your suspension back together. |
Put everything back together and check for clearance around the 'bag. Make sure nothing's rubbing, since we all know ruptured 'bags on the side of the road are no fun. | 
In order to stuff these DUBS, you need to tub your firewall. So set your mark and cut away. |
Cut all the way around and bolt your wheel on to check for clearance. If you need more space, cut carefully, ensuring you don't cut any important wires. Then recheck for clearance. | 
Now put your fender back on and stare at it. Walk over to the phone and call your buddies if they're not there already. The next step is obvious: Brag about it. Who's tucking 20s? You are. |
You'll need to install an aftermarket intake like this K&N setup. You can also relocate your ABS to the front of the truck, since there is room. | 
You'll need to relocate the brake master cylinder. Here, it's been relocated to the front by the core support. |
Put your fenders and grill back on and it should look something like this. Now you're ready to cruise and roll those dubs. | |