I added some pics from underneath and you can see the Professional system that was built.
The muffler body is 14" long and 20" overall length.
As to loudness, it is much louder than the stock system, but nothing like the Civics with their 8" round pipes.
Outside, standing at the side of the road, it's barely audible when it passes @ 50-60MPH, unless you stand on it. I had the wife do just that so I could hear it.
Inside the car you can hear it better until you hit cruising speed and it gets very quiet.
I wanted the 350Z sound level but it turned out twice+ the level.
For my old ears it's too loud and I plan to sell it for what I paid to have it made. :cry:

http://pg.photos.yahoo.com/ph/xfinte...onal/my_photos