Bought the truck with a complete Borla 2.5" system on it. Didn't like it, it had a pretty loud drone at freeway speeds. Like, loud enough that on a road trip you could still hear it for awhile in your head after you'd stopped.
Muffler went out, replaced with a Magnaflow (couldn't use the Borla warranty without receipts, thanks PO!). It was $150 installed. Much quieter, but still has a little bit of a beefy tone to it.
And then, just for kicks, the cat went out, so I replaced it with one from Summit Racing, just a 2.5" universal that's OBD compliant. It was $60 and $40 for install. Now, with that combo, it's got good tone and seems to have more pep (may just be that it doesn't have to force the exhaust through a half blocked cat) .