Question about muffler pipe

I own a 1999 Honda Accord EX (4 cyld.). I have a Chilton's Repair Manual related to my car and I saw a picture on page 8-5 that was really confusing to me. The muffler pipe has a connector on it. It has a section
of pipe that runs off of the main pipe and appears to be running upward into the interior of the vehicle. Could someone please tell me the purpose of the pipe that is running from the main pipe in an upward direction towards the interior of the vehicle?
--
NEWSGROUP SUBSCRIBERS MOTTO
We respect those subscribers that ask for advice or provide advice.
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Show us. http://tinyurl.com/73zt7
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.