4.0 exhaust question-headers? - JeepForum.com
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Unread 07-09-2009, 02:39 AM   #1
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1998 ZJ 
Join Date: Jan 2007
Location: zeeland. Mi.
Posts: 27
4.0 exhaust question-headers?

So, I was just informed that all 4.0 engines came with headers from the factory, is this true?

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Unread 07-09-2009, 06:02 AM   #2
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Join Date: Jun 2004
Location: Phoenix, AZ
Posts: 5,880
Not true - the 4.0 had an exhaust manifold. Yes, it's tubular in nature, giving some the impression that it's a "header." However, the tubing is not tuned in length, nor are there any collectors, and thus it's simply a manifold, not a header.
Kolak Performance and Offroad
Member: Specialty Equipment Market Association
Telephone: 480 998-3661
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