Vibration absorbing section at front of exhaust

Lee123

The Nismo exhaust and, as I recall, the original factory exhaust both have a small section of flexible pipe near the front that appears to be designed to absorb vibration. Most of the aftermarket pipes like Stillen don't have it. Was this just unnecessary over engineering by Nissan or is there some negative to not having it? I'm thinking about getting something a bit louder than the Nismo and have been reading everything here on pipes but I haven't seen anything about this, possibly since I don't know what this little section of flexible pipe is called so I can't find it with search.

I bought the Nismo because I didn't want the car too loud since I have the top down all the time and like to hear the radio. I had a Magnaflow on my last car and liked that. It's hard to tell the actual loudness from sound clips since the camera used to make the clip and the speakers on the PC determine the sound level. So far Stillen seems to be the next step up in loudness from the Nismo. I don't want to make another $1400 exhaust mistake.