Better quality?

[Duckydos]

But something you do have to consider. If you buy the brand name exahust (Apexi, HKS, Tanabe, etc.) you have a general understanding of what they'll sound like. You do your own exhaust by mixxing and matching peices together, the final sound is a total guess.
I did that just, got a Focuz muffler (I liked the look) for $125 and paid a shop another $175 to do 2.25" piping from the cat-back (if you look on '98 and up Accords, the bend under the rear chassis actually makes it less then a 1" diameter.) Leaving the shop, it sounded like ass... ass on a stick to be particular. But over time o2 sensors have burned out and it doesn't sound too bad anymore. Anyway, fact of the matter is, you do your custom exhaust, it's going to be loud and obnoxious most of the time.

-Ducky