All I can give you is this advice.
Cheap exhausts won't last, you'll pay less money several times making it cost more than the quality exhaust up front. It's worth buying a great exhaust from a company like invidia, Corsa, nameless, ETS. Than a cheap eBay exhaust that will likely rust at the welds in no time.
From what I've always been told flow through exhausts similar to those like magna flow will offer a great blend of sound and exhaust gasses will flow faster through them than a traditional muffler delete due to the lower friction in the muffler. Because of the perferated pipe on the inside the air creates a cushion that allows flowing exhaust gas to move faster and not tumble off the walls.
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