High flow Quiet exhaust

Does anyone make a quiet cat back system for a 4dr? I want good flow with stock sound. Anyone know of a company?

The only company I know of that makes a cat-back for the 4dr is Thermal R&D. A lot of people up here have Thermal cat-backs & they sound pretty nice. They're a little louder than stock, but not obnoxious.

I'm sure there's other companies that make cat-backs for the 4dr, but I don't know of any...

a dude just wrote about this on fourthgenerationfourdoor at yahoo wich can be found here
http://autos.groups.yahoo.com/group/fourthgenerationfourdoor/

i'll bring a quote by a guy named dingusjt from there
quote
ok many of you probably knew this but i just found this out for
myself...so for the few that might not know..HB exhaust is identical
to sedan exhaust...bolts up perfectly all the right bends in all the
right places even has attachment hooks located in the same
spots...the only difference is that Sedan tailpipe is about 8 inches
longer...thats it....
quote
i asked a guy that put a dc cat back from a hatch onto his 4 door how it went,,,he said the only thing he had to do was take it to a muffler shop to extend the tailpipe,

and i heard hks sport exhaust is pretty quiet,,check this thread out from honda-tech
http://honda-tech.com/zerothread?id=704617

well if thats true get RSR its probbly best out there imho great flow nice tone quiet.