Unfortunately, I don't have any experience with Bassani mufflers. But I don't think you could go wrong by getting the whole Bassani Set-up.
If you live in an emissions area, be sure to get the X-pipe with cats to keep the law men happy...
If you listen carefully to the .wav file for my car, you'll be able to here just a bit of that popping sound as it comes down from the high revs... From what I've been told, it's normal. Just the exhaust pressure equalizing itself in the larger exhaust.
I was quite please with the performance and sound from this combo, and I think you will be too if you go the same route.
Hope this helps...
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1998 Mustang GT
13.97@103
"Traction Impaired" or "Nitto Needy"