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Pacesetter exhaust manifold - "warm up cat"?

Old 04-27-2019, 12:30 AM
  #1  
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Join Date: Apr 2019
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Model: Cherokee (XJ)
Default Pacesetter exhaust manifold - "warm up cat"?

Hello,
I'm planning to get pacesetter manifolds to replace a cracked on on an XJ I'm buying this week. There are 2 different options, one with 2 bungs and one with 1 bung for O2 sensors (AFAICT).

They are at:

PaceSetter Jeep Cherokee 4.0L Header with Dual Outlet and Warm-Up Catalytic Converter
https://www.morris4x4center.com/head...st-701190.html

-or-
PaceSetter Jeep Cherokee 4.0L Header with Dual Outlet without Warm-Up Catalytic Converter
https://www.morris4x4center.com/head...st-701192.html

This is a Virginia car with AFAICT, one cat. I'm bringing it into PA which also AFAICT has the same laws and tests. I have no idea if I need the one with 2 bungs or just one. Any advice would be great!

Thanks!
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Old 04-27-2019, 12:21 PM
  #2  
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Join Date: Dec 2015
Location: PA
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Year: 1997
Model: Cherokee
Engine: 4.0L
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The header in link #2 is a cat delete, hence the extra pipe. Everything else looks the same to me. Do not delete the cat in PA as they want all emissions equipment intact. I do not remember what years get the sniffer, but my 97 did not. What year do you have? The 99 and older had one cat just before the muffler. Starting in 2000, XJ sold in California (and possibly New York, not sure) had 2 small pre-cats next to the engine. And 2000 sold elsewhere used the same 99 and older setup with a single cat.

Last edited by fb97xj1; 04-27-2019 at 12:26 PM.
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Old 04-27-2019, 12:25 PM
  #3  
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Originally Posted by fb97xj1 View Post
The header in link #2 is a cat delete, hence the extra pipe. Do not delete the cat in PA as they want all emissions equipment intact. I do not remember what years get the sniffer, but my 97 did not. What year do you have? The 99 and older had one cat just before the muffler. Starting in 2000, XJ sold in California (and possibly New York, not sure) had 2 small pre-cats next to the engine. Other 2000 used the same 99 and older setup with a single cat.
Whoops, all great information! Sorry I can't believe I forgot to mention the year and submodel. I'm picking up a 1997 Sport SE tomorrow. Apparently a motor mount broke which of course caused a hairline crack in the current manifold. Sounds like I should be getting the one in link #1, because there is a single cat on the intermediate pipe (if that's the right name, it's what we call it in the Subaru world).
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