What year is your truck, what motor do you have, and what transmission do you have? Your sig says its a 2004 with a 3.7.
If you have an 09-up 5.7 truck, then longtubes alone will make the exhaust a bit deeper, but its the cats that make the biggest difference in how loud the truck will be. Running the ARH setup with their high flow cats isn't much louder than stock. Running without cats though can be obnoxious.
Reguardless, the longtube kits for these trucks are designed to clamp right onto the factory exhaust behind the Y-pipe.
Shorties are only good for about 10hp, so I'm not a fan of them on these trucks.