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Unread 05-22-2001, 10:56 PM   #1
Alan
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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

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Unread 05-23-2001, 11:17 AM   #2
goofus
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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.
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Unread 05-23-2001, 12:12 PM   #3
Alan
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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
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Unread 05-23-2001, 02:16 PM   #4
goofus
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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.
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Unread 05-23-2001, 02:20 PM   #5
goofus
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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/
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Unread 05-23-2001, 10:23 PM   #6
Alan
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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
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Unread 07-31-2001, 01:47 AM   #7
91 sahara
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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
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