V6 XWD mufflers : the beauty is inside... - Saabnet.com Bulletin Board

[General | Members | C900 | 9000 | NG900 & OG93 | 93 | 95 | NG95 | 99 | Sonett | Vintage Models | Performance | Detail | Clubs & SOC | Other Cars | Books Movies & Music | Chat | FAQs | Gifts | Member Photo Galleries | Member Directory | Classifieds | Service/Mechs | Manuals | *Buddy Registry | *Mileage Registry | Polls | What's New | Raffle | Photo of the Month | Sponsors]

93 Bulletin Board
2003-2011
Search:
(Search Author's Posts: e.g. Keyword:Author)*Members Only

[Main 93 Bulletin Board | Post Followup | BBFAQ ] [ Prev by Date ] [ Next by Date ] Member Login / Signup [Most Recently Edited Saabnet.com Photo Galleries]
V6 XWD mufflers : the beauty is inside...
Posted by magalar [Email] (#1325) [Profile/Gallery] (more from magalar) on Fri, 27 Apr 2018 20:46:13
Alert me when someone posts in this thread:
Quick summary : I was looking for a quick-swapping and cheap "sport" exhaust for my 2008 XWD that I track 5 or 6 times a year (winter and summer). So I bought a used 2011 XWD 4-cyl stock cat-back to replace the 2008 stock unit that is showing some internal wear (a 3 inch perforated pipe came out of one of the mufflers).

Yesterday, I did cut-open the top of both rear stock mufflers. What I found is very interesting.

1- Both of these mufflers are straight trough and they don't have any baffles at all. The mufflers are divided in the middle by a wall. The gas flow comes in the first chamber, where it passes through a perforated pipe surrounded by glass wool. This pipe then passes through the wall but stops there. The gas flow then expand in the second chamber, which is completely empty, and flow to the outlet without any obstruction.

2- Each muffler is different. The driver side unit is divided 50/50 with the wall right in the middle. The passenger side muffler is divided 25/75, with the bigger chamber being the first (front of the car).

3- The driver side unit is bigger in volume, and it is double-walled. And between each layer of stainless steel, there is a thin layer of a white insulating material that looks like paper (but it is not...).

Now I know why the car was sounding strange last summer at the last track day: the left muffler was completely blocked by glass wool as there was no perforated pipe in there anymore. The exhaust flow was pushing against the wool to expel it trough a 2 inch hole in the middle wall. The right muffler was ok.

Sound wise, I don't expect a huge increase in noise with the emptied muffler, but I did connect the inlet and the outlet together with some 2 inch pipes to make them really straight through. The open-top cans are now just there to support the brackets and to look stock from under and behind. If sound is OK, then I will re-weld the tops.

Anybody know the internal construction of the tiny "resonator" where the system splits in two? If it was just a "Y", there is no need for that stainless steel box around it.
Posts in this Thread:
Alert me when someone posts in this thread:
Post a Followup

No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.

Name: Member Login / Signup [Most Recently Edited Saabnet.com Photo Galleries]
E-Mail: (Optional)
Re-Enter E-Mail: (Confidential & Secure - Not revealed to other users!)
Note: Please check your spam folder for BB responses.
If you use GMail, follow these instructions from Google so that they appear in your regular inbox.

Subject:

Posting rules are simple - No for sale/wanted ads or live auctions may be here - use the classifieds.
You may not cross-post your message to multiple BBs.
Personal attacks, insults, or flaming are not allowed.
 Site Members do not see any red text, inline ad links, bottom of page anchor ads, box ads, or anti-spam check.

Message: (please no for sale/wanted classifieds - post those in the TSN Classifieds)
To add inline links to your post, use [link]http://www.domain.com/[endlink] or use the Optional fields below.
To add inline images to your post, use [img]http://www.domain.com/img.jpg[endimg] or use the Optional Image Link field below.

Optional Link: (e.g. http://www.saabnet.com/)
To promote your own Saab site here, you must have a link back to The Saab Network.
Link Title: (Optional)
Optional Image Link: (e.g. http://www.saabnet.com/img.jpg)



The content on this site may not be republished without permission. Copyright © 1988-2018 - The Saab Network - saabnet.com.
For usage guidelines, see the Saabnet.com Mission and Purpose Page.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]
This is a moderated bulletin board - Posting is a privilege, not a right. Unsolicited commercial postings are not allowed (no spam). Please, no For Sale or Wanted postings, SERIOUSLY. Classifieds are to be listed in The Saab Network Classifieds pages. This is a problem solving forum for over 250,000 Saab owners, so expect to see problems discussed here even though our cars are generally very reliable. This is not an anything goes type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the Saabnet.com Mission and Purpose Page. Please remember that you are not anonymous. Site Contact | Site Donations | Other Sites by SP - Poverty2Prosperity.org
Your address is: 54.91.203.233 - Using CCBot/2.0 (https://commoncrawl.org/faq/) - Logged.


v.1010123
Site Members do not see red text instructions, bottom of the page anchor ads, or box ads.
Click here to see all the Site Membership Benefits!