'00 4.7L muffler question. - JeepForum.com
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > '00 4.7L muffler question.

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineFS: Jeep Fog Light LED Bulbs! Several Brightness Options! Black Friday is coming...Sign up for our Newsletter NOW!!!

Unread 06-13-2012, 06:05 PM   #1
Registered User
2000 WJ 
Join Date: May 2007
Location: Ontario, Canada
Posts: 42
'00 4.7L muffler question.

So... in 2008 I replaced the original muffler with a cheap Speedy generic muffler. Fuel mileage actually went down when I changed it and it's due to be changed again, but I hesitate as the bigger the hole and louder the muffler gets, the less fuel I actually use. Right now I'm getting about 600km to a tank with E10 fuel on highway driving. The last fill-up said I got 12.9L/100km

Bottom line is that the muffler is getting quite loud now and really does need to be changed, but I don't want to change it for one that'll create too much back pressure reducing my fuel economy. I was thinking of possibly getting a Magnaflow, with maybe the dual out tail pipes.

Anyone have any suggestions of a muffler that'll not affect my gas mileage?

2000 Grand Cherokee Laredo.
4.7L V8


PurpleSplat is offline   Reply With Quote Quick reply to this message
Unread 06-13-2012, 09:02 PM   #2
Registered User
1996 ZJ 
Join Date: Jun 2011
Location: Congers, NY
Posts: 361
You're in the ZJ (93-98) section... Go check out the WJ side...
congerz83 is offline   Reply With Quote Quick reply to this message

exhaust , fuel economy , gas mileage , muffler

Quick Reply

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools

Suggested Threads

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.