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Old Mar 7, 2011 | 01:33 PM
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pardon the dumb question, but i cant seem to remember the size of the tubing. Is it 2.5 or 2.25?
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Old Mar 7, 2011 | 01:35 PM
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From: South Of San Antonio Tx.
Year: 1994
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2.25 or just 2"
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Old Mar 8, 2011 | 02:58 PM
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Originally Posted by Txssp
2.25 or just 2"
Thats a 1/4 inch difference.

The chunks I've measured were all 2.25"
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Old Mar 8, 2011 | 06:11 PM
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From: Suffolk long island
Year: 1994
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Engine: 4.0 L I6
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i thought they were all 2.25 but i installed a CAT for a fellow XJ owner and found out everything cat back was 2", couldn't tell if it was stock or not, but i know we had to exchange some pipes.
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Old Mar 8, 2011 | 07:12 PM
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Year: 1998
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'98s are 2.5" ahead of the cat and 2.25" after.
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Old Mar 8, 2011 | 07:35 PM
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Anyone know the pipe diameter going into the cat on a '91? Sorry to jack the thread, but since different year numbers werebeing tossed around, I figured it would be ok to ask.
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Old Mar 9, 2011 | 10:22 AM
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well, i found tht my pipes are 2.25 at the cat and backward. not too sure about b4 the cat, but it looks to be the same
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Old Mar 9, 2011 | 11:02 AM
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Originally Posted by clacker
well, i found tht my pipes are 2.25 at the cat and backward. not too sure about b4 the cat, but it looks to be the same
Pretty sure thats how mine is as well.
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Old Mar 9, 2011 | 11:46 AM
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Maybe the larger pipe started in '91 with the H.O. 13hp increase?
Attached Thumbnails exhaust-004.jpg   exhaust-005.jpg  
Last edited by djb383; Mar 9, 2011 at 11:48 AM.
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Old Mar 9, 2011 | 11:48 AM
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1991Jeep_Man
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Originally Posted by djb383
Maybe the larger pipe started in '91 with the H.O. 13hp increase?
Seems like it would make sense, plus considering where I've heard HO exhaust ports and such being different. Oh well, worse case scenrio is it's 2.25" before the cat and I just get an adapter lol.
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