Cat or Muffler - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
Thread Tools
post #1 of 3 Old 01-07-2010, 02:58 PM Thread Starter
Registered User
Join Date: Dec 2009
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Cat or Muffler

If you could do just one which would give you the best HP. and mileage a high flow cat or a after market muffler. I guess what I'm asking on a stock exhaust which constricts the most air.
regliz is offline  
Sponsored Links
post #2 of 3 Old 01-07-2010, 07:40 PM
Registered User
Join Date: Feb 2009
Posts: 21
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
On most vehicles a performance muffler and hi flow cat flow about the same air. From a performance standpoint they will do about the same. Figure 2-5hp for either. Straight through mufflers flow a little better and if a motor has a higher hp rating, you can expect maybe a little better gain. Now compare that to mandrel bent piping replacing an exhaust that had compression bent piping and you will gain anywhere from 15 to 50 hp! The big gains are in the piping, not the muffler or the cats. That being said, I'd do the muffler because it's cheaper and doesn't void your warranty.

Fool around, Get hurt, Don't come crying to me
Official DodgeTalk Supporter

Ccass is offline  
post #3 of 3 Old 04-15-2013, 05:06 PM
Registered User
snowfighter10's Avatar
Join Date: Mar 2013
Location: Colorado Springs, CO
Posts: 51
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My stock exhaust on my 88 looks so restricted! The factory y-pipe is more like a
T-pipe. I plan on keeping factory manifolds but from a 92 or newer. According to one of the other members on this site, they will have 2-1/4 inch outlets. I want to go 2-1/4 all the way to the new y-pipe then into 3 inch the rest of the way back. Mandrel bent, free flow cat (or cat delete). Then a quiet but non-restrictive muffler. My days of LOUD exhausts are over. Less attention from Johnny Law, plus I don't need to sound like I'm going fast. It's a truck, for Pete's sake! I just want the Gray Goat to breathe a little better.
snowfighter10 is offline  

Quick Reply

Register Now

In order to be able to use most of our features, 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
The registration process requires you to activate your membership by following a link in an E-Mail that will be sent to you immediately upon completing this form. You must enter a valid email address or you will not receive this activation code and you will NOT be registered. Your E-Mail address is NOT publicly available to anyone as policy.

AOL E-MAIL USERS: Please click HERE for important info pertaining to your e-mail address.

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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Muffler/Cat Question Ram Boy '04 2G Dodge Ram Performance Talk 18 11-30-2006 06:33 PM
Stock cat and muffler 05CTDRKS 3G Dodge RAM Diesel Talk 2 02-19-2006 09:29 PM
muffler or cat-back nothing 2G Dodge Dakota Performance Talk 28 03-25-2004 02:31 PM
muffler only, or cat-back? kvndoom 2G Dodge RAM - General Talk 2 12-06-2002 07:59 AM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

For the best viewing experience please update your browser to Google Chrome