Stock Exhaust, How restrictive is it? - JeepForum.com
 
LinkBack Thread Tools
post #1 of 7 Old 05-22-2001, 10:56 PM Thread Starter
Alan
Registered User
 
Join Date: Apr 2001
Location: Nauvoo, Alabama
Posts: 7
Stock Exhaust, How restrictive is it?

Hi & tia for reading this. I have a 98 tj 2.5l. Just wondering if replacing the exhaust system (after cat) with a aftermarket setup would help performance much. Also any recommendations? I don't want an exhaust thats much louder than stock.
Alan

Alan is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 05-23-2001, 11:17 AM
goofus
Registered User
2005 LJ Wrangler 
 
Join Date: Apr 2001
Location: CT
Posts: 601
With the 2.5L, don't bother. It won't make much of a difference. I have a 2000 2.5L TJ and tried out a cat-back. First off, it sounds horrible- like some pimped-out Honda Civic. I could see how a 6 or 8 cylinder would sound good.
I actually found that the 2.5L needs some back pressure. I recently went back to the stock exhaust and noticed absolutely NO difference in power. And it sounds SO much better....
If you are looking for some solid add-ons to squeeze a few more HPs out of that 2.5L, just go with the simple stuff.

1 Air intake- try rustysoffroad.com .
2 Throttle body spacer- I got mine from central4wd.com for $60. It actually added some usable torque in the 2200-3000 range.
3 Spark plugs- get decent new ones and make sure they're gapped correctly.
4 Spark plug wires- get decent ones (7mm+).
5 Get your intake/fuel system cleaned out.

2013 2500HD
2005 Unlimited
2003 Rubicon
2000 SE
1997 XJ
85 FJ-60
goofus is offline  
post #3 of 7 Old 05-23-2001, 12:12 PM Thread Starter
Alan
Registered User
 
Join Date: Apr 2001
Location: Nauvoo, Alabama
Posts: 7
Thanks for the info, guess no exhaust changes for me. I've already put on the t/b spacer and it made a difference in power, not mpg. I changed out the oem filter with a K and N, not much difference. I'll have to try the air tube change. How come the Rusty's off road product is so much cheaper?
And, can you tell a difference? later.Alan
Alan is offline  
post #4 of 7 Old 05-23-2001, 02:16 PM
goofus
Registered User
2005 LJ Wrangler 
 
Join Date: Apr 2001
Location: CT
Posts: 601
The Rusty's air intake saves everthing except the big rectangular air filter housing box over the passenger side fender. The box is replaced by an extremely simple, tubular K&N cone filter-type mount-thing. The (relatively expensive) K&N air intake replacement system replaces all the intake parts right up to the throttle body- and I don't know how much different the Rusty's is vs. the K&N. I'd say the diff. is probably nominal. I'm happy with the Rusty's.
In the end, I think there's only so much you can do to the 2.5L. I've seen guys add superchargers and intercoolers (see 4-Bangers United, http://www.forumco.com/jeffy/ ), but at that point, you'd be better of finding a vehicle with an 8 already in it.

2013 2500HD
2005 Unlimited
2003 Rubicon
2000 SE
1997 XJ
85 FJ-60
goofus is offline  
post #5 of 7 Old 05-23-2001, 02:20 PM
goofus
Registered User
2005 LJ Wrangler 
 
Join Date: Apr 2001
Location: CT
Posts: 601
Another thing I forgot- I just read an article on putting the 4.0 throttle body on the 2.5L intake. Apparently, it worked and the write up was good.
http://www2.hawaii.edu/~jyokomur/tech/throttlebody01/

2013 2500HD
2005 Unlimited
2003 Rubicon
2000 SE
1997 XJ
85 FJ-60
goofus is offline  
post #6 of 7 Old 05-23-2001, 10:23 PM Thread Starter
Alan
Registered User
 
Join Date: Apr 2001
Location: Nauvoo, Alabama
Posts: 7
Thanks for the info. The t/b spacer I installed was for the 4.0l, but it works great on the 2.5. I live not far from rustysoffroad so I'll go check em out one day. Gee wish I hadn't bought that stock airbox filter now...Alan
Alan is offline  
post #7 of 7 Old 07-31-2001, 01:47 AM
91 sahara
Registered User
 
Join Date: Jul 2001
Location: monroe, wa
Posts: 19
you could remove your air intake restrictor cone, for details see www.jeepyj.net then look under free easy hp gain . it worked for me

91 sahara 4.0 5sp hardtop 31's on 15x8 m/t classic 2's rock-it air intake and k&n so far.
91 sahara is offline  
Reply

Quick Reply
Message:
Options

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:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









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



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
94 Jeep Cherokee Sport, stock rims winter tires Is smaller then stock an issue? brahm Tires & Wheels 6 01-07-2009 02:31 PM
Is it better to have a free-flowing or restrictive exhaust for running submerged? flatlander757 General Jeep & Off-Road Equipment 2 11-22-2007 09:30 AM
Stock Rubicon: Any experience with pure stock plus front disconnects godell Tires & Wheels 10 06-06-2005 10:26 AM
1997 ZJ Swapped stock cassette for stock CD, and have a problem.... doccjp Stereos, CB & Ham Radios, GPS, & Electrical. 0 03-25-2004 07:07 PM
Rusty's Flowmaster exhaust or custom exhaust setup? 4x4 XJ Engines & Drivetrain 0 01-20-2003 06:17 PM

Posting Rules  
You may post new threads
You may 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
Trackbacks are Off
Pingbacks are On
Refbacks are On

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