I have the Street Comp cat back. I think they offer the Street Comps standard and you have to special order the Quiet Thunders. At least, that's what my exhaust shop told me. I'd check the part numbers just in case. They also recommend the BX series because they said it would be okay with the weather here.
Seraphitia102, I would hit up ebay and the classifieds in other forums to try to find someone selling a used Bassani cat back.
which is louder, the Street Comp or the Quiet Thunders?