Should I straight pipe? - JK-Forum.com - The top destination for Jeep JK Wrangler news, rumors, and discussion

Notices
Modified JK Tech Tech related bulletin board forum regarding subjects such as suspension, tires & wheels, steering, bumpers, skid plates, drive train, cages, on-board air and other useful modifications that will help improve the performance and protection of your Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) on the trail.

PLEASE DO NOT START SHOW & TELL TYPE THREADS IN THIS FORUM
Sponsored by:
Sponsored by:
View Poll Results: What should be done?
STRAIGHT PIPE IT!!!
2
28.57%
SUCK IT UP!
5
71.43%
Voters: 7. You may not vote on this poll

Should I straight pipe?

Reply

 
 
 
Old 02-05-2016, 04:45 PM
  #1  
JK Newbie
Thread Starter
 
RADAR's Avatar
 
Join Date: Jul 2014
Location: Prescott, Arizona
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Default Should I straight pipe?

I happen to live in a wonderful county where there is no emissions testing. It is, therefore, common for people to straight pipe their rigs of all kinds here. Also, rust is only a rumor of the coastal areas of this great country and does not exist in this pristine location. So the question, and title of this thread is: Should I straight pipe my 07 JK? I have heard rumors that removing the cats and shutting of the 02 sensors can seriously mess with the tuning and destroy engine performance. I don't want that. I realize I should actually talk to one of the shops here that straight pipe vehicles but I wanted to see if anyone in this community had some sage advice or warnings or any general exhaust wisdom to share. I don't want to be overly loud. But I do want a meaty grumble (yes I know I should put a hemi or 350 or a I6 cummins or anything better than the 3.8 to get what I want) and, most importantly, the added power and efficiency that allowing and engine to breath gives you. So who has stories of tragedies or any words of encouragement for this undertaking. Please note, I do have to make many elevation changes of over 1000' during my adventures.
RADAR is offline  
Reply With Quote
Old 02-06-2016, 12:32 AM
  #2  
JK Super Freak
 
zstairlessone's Avatar
 
Join Date: Dec 2009
Location: Texas
Posts: 1,695
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Modern cats don't affect performance so if you are looking for more noise just do a muffler delete, that's where your back pressure is coming from but don't be surprised if the neighbors get upset
zstairlessone is offline  
Reply With Quote
Old 02-06-2016, 08:08 AM
  #3  
JK Junkie
 
D_engel's Avatar
 
Join Date: Sep 2010
Location: Tempe AZ
Posts: 2,539
Thanks: 0
Thanked 0 Times in 0 Posts
Default

These 3.8's do better with some back pressure. If you straight pipe it, you will lose what little low end torque these motors have.
D_engel is offline  
Reply With Quote
Old 02-06-2016, 10:48 AM
  #4  
JK Junkie
 
Invest2m4's Avatar
 
Join Date: Jun 2013
Location: Grosse Pointe, MI
Posts: 3,694
Thanks: 0
Thanked 1 Time in 1 Post
Default

Ask Maertz about it. He did it. Currently looking for ways to quiet it down. Jeeps suck with loud exhaust. Too much of the noise enters the cabin.
Invest2m4 is offline  
Reply With Quote
Old 02-06-2016, 03:20 PM
  #5  
JK Freak
 
pontiac31's Avatar
 
Join Date: Jan 2009
Location: Erie, PA
Posts: 896
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I blew the muffler off on a trail and I can say it sounds worse then a civic with a fart can.
pontiac31 is offline  
Reply With Quote
Old 02-06-2016, 03:28 PM
  #6  
JK Enthusiast
 
brankz's Avatar
 
Join Date: Aug 2013
Posts: 319
Thanks: 0
Thanked 0 Times in 0 Posts
Default

But a dynomax rock crawler or you can buy the dynomax ultra flow from me 😏😁
brankz is offline  
Reply With Quote
Old 02-06-2016, 03:33 PM
  #7  
JK Super Freak
 
shabbernigdo's Avatar
 
Join Date: Nov 2012
Location: missouri
Posts: 1,098
Thanks: 0
Thanked 0 Times in 0 Posts
Default

people who make their vehicles stupid loud are just crying for attention. if you really want that just paint it barbie pink. you will get the attention and it wont bother others. you wont gain anything on an na engine with straight pipes infact you will probably lose some low end.

Last edited by shabbernigdo; 02-06-2016 at 03:36 PM.
shabbernigdo is offline  
Reply With Quote
Old 02-06-2016, 09:24 PM
  #8  
JK Newbie
 
Join Date: Feb 2015
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Here ya go.
Attached Thumbnails Click image for larger version

Name:	image-2964120172.jpg
Views:	97
Size:	443.7 KB
ID:	636858  
falcon241073 is offline  
Reply With Quote
Old 02-07-2016, 07:57 AM
  #9  
JK Freak
 
pontiac31's Avatar
 
Join Date: Jan 2009
Location: Erie, PA
Posts: 896
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I had cut a magnaflow into the pipe between the frame rails then had a local muffler shop bend me a new tailpipe. Total cost was around 150 bucks, it's all stainless and has a nice sound that doesn't attract attention.
pontiac31 is offline  
Reply With Quote
Old 02-08-2016, 07:28 AM
  #10  
JK Enthusiast
 
Grant09's Avatar
 
Join Date: Jun 2009
Location: Dallas, TX
Posts: 199
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Originally Posted by RADAR View Post
I have heard rumors that removing the cats and shutting of the 02 sensors can seriously mess with the tuning and destroy engine performance. I don't want that.
I don't know how removing the cats will affect performance (very little from what I understand) but you certainly don't want to remove the o2 sensors. The engine computer uses the readings from those to control the fuel mixture. It'll still run without them (although with the light on the dash on all the time) because there's a default tune the engine uses until the o2 sensors warm up but if you remove them then you're using that default all the time. This isn't ideal, especially with the elevation changes you mentioned.
Grant09 is offline  
Reply With Quote

Quick Reply: Should I straight pipe?


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: