12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

I Want To Ditch My Cat But Not My Muffler. Bad Idea???

Thread Tools
 
Search this Thread
 
  #1  
Old 08-26-2007 | 08:03 PM
erik s's Avatar
Thread Starter
|
Diesel Fan
Joined: Apr 2007
Posts: 36
Likes: 0
From: Idaho
Default I Want To Ditch My Cat But Not My Muffler. Bad Idea???

Now that I eliminated the EGR valve on my 97 Cummins (california edition) I want to ditch my Cat but I don't want to have alot of drone in the cab as i drive the truck alot. I am just trying to increase the efficiency of my exhaust as i am adding a #10 plate and a 3k GSK. If I fully Strait pipe the exhaust (eliminate the cat and muffler) is it going to be excessivly loud in the cab at highway speeds. Would i be upset with myself if i leave the muffler in. I live in Idaho so emmissions or the legality of exhaust is not an issue.
 
  #2  
Old 08-26-2007 | 08:07 PM
redneckbuckeye's Avatar
Diesel Bomber
Joined: Mar 2007
Posts: 1,339
Likes: 75
From: Sheridan,IN
Default

Do it , I love the sound, but have no idea if it will have a lot of in cab drone.
 
  #3  
Old 08-26-2007 | 08:08 PM
Dr. Evil's Avatar
BOMBARDIER
Joined: Mar 2007
Posts: 23,293
Likes: 1,322
From: North of You
Default

erik, with the mods you are planning IMHO you really should have 4" or bigger exhaust.

They can be had very reasonably. (under $300 if you shop around)
 
  #4  
Old 08-27-2007 | 02:57 AM
Queeg's Avatar
Diesel Enthusiast
Joined: Apr 2007
Posts: 400
Likes: 16
From: fullerton ca.
Default

if you keep the tailpipe out behind the rear wheel the drone is low. mine is terribel and loud in the cab. it dumps right at the end of the cab. and at hiway speeds it almost unnoticed unless i accelerate
 
  #5  
Old 08-27-2007 | 08:09 AM
Johnny Cetane's Avatar
Diesel Bomber
Joined: Mar 2007
Posts: 6,191
Likes: 492
From: Behind You
Default

i couldn't stand mine when i had it straight piped. about 2100 rpms it just killed my ears. like doc said, with the mods you are planning you should just head straight for the 4" exhaust. i'd do that before your planned mods because the exhaust will help with the added exhaust temps your mods are gonna produce.
 
  #6  
Old 08-27-2007 | 09:01 AM
Dr. Evil's Avatar
BOMBARDIER
Joined: Mar 2007
Posts: 23,293
Likes: 1,322
From: North of You
Default

Thats is a good point....I strait piped mine too (12V) and found that it was a waste of time and effort. The drone was terrible, and it sounded like a tractor (which is ok if your a farmer). Drove its like that for a few months and then went to a 4" with muffler. Its awesome now.


This is an exhaust from one of our sponsors (I just picked one at random) and its pretty hard to beat:

http://www.vulcanperformance.com/ser...minized/Detail


Here it is in SS: http://www.vulcanperformance.com/ser...ainless/Detail

You can get a 5" for a little over $300
 

Last edited by Dr. Evil; 08-27-2007 at 11:04 AM.
  #7  
Old 08-27-2007 | 08:54 PM
erik s's Avatar
Thread Starter
|
Diesel Fan
Joined: Apr 2007
Posts: 36
Likes: 0
From: Idaho
Default

does anyone have any experience with Vulcan Exhaust. Would there be that much of a reduction in EGT's if i go with the 5in. over the 4in. Is the 4in. adequate.
 
  #8  
Old 08-28-2007 | 11:16 PM
Dr. Evil's Avatar
BOMBARDIER
Joined: Mar 2007
Posts: 23,293
Likes: 1,322
From: North of You
Default

4" is really adequate. You really only NEED a 5" if you are getting over 500 hp....but the 5" DOES look way cool (to me at least).
 
  #9  
Old 08-29-2007 | 08:13 AM
Buckshotmckee's Avatar
Sma't Alec!
Joined: Mar 2007
Posts: 1,522
Likes: 135
From: God's Country
Default

3'in straight pipe is terrible! 4'in straight pipe is awesome! I recommend the Donaldson 10'in resonator. You keep the sound but loose the drone.
 
  #10  
Old 08-29-2007 | 03:19 PM
Johnny Cetane's Avatar
Diesel Bomber
Joined: Mar 2007
Posts: 6,191
Likes: 492
From: Behind You
Default

Originally Posted by Buckshotmckee
3'in straight pipe is terrible! 4'in straight pipe is awesome! I recommend the Donaldson 10'in resonator. You keep the sound but loose the drone.
you got a PN to share with the rest of us????
 



All times are GMT -5. The time now is 06:38 PM.