dakal Posted April 6, 2011 Share Posted April 6, 2011 tell me if i got this correct. on a stock 1988 4.0, the exhaust from the manifold is 2 1/2 in to the cat and from the cat is 2 1/4 in. or is the cat 2 1/4 in also. thanks, dave Link to comment Share on other sites More sharing options...
alleydog Posted April 7, 2011 Share Posted April 7, 2011 I was thinkin it was 2.25 all the way, but my 89 has a bolt on flange, so its hard to tell. Link to comment Share on other sites More sharing options...
dakal Posted April 7, 2011 Author Share Posted April 7, 2011 mine is 2 1/2 all the way. from the flange ,the cat back is 2 1/2. but i can't trust anything that been done to the truck. Link to comment Share on other sites More sharing options...
alleydog Posted April 8, 2011 Share Posted April 8, 2011 Thats cool! I guess I was thinking of my YJ, which is 2 1/4. My MJ is 2 1/2 but I cobbled it on there from a Dakota. Hey it was free! Link to comment Share on other sites More sharing options...
kyleag89 Posted April 8, 2011 Share Posted April 8, 2011 I know on a stock MJ the pipes are 2 1/4(2.25) all the way. Link to comment Share on other sites More sharing options...
dakal Posted April 8, 2011 Author Share Posted April 8, 2011 kyleag89 Post subject: Re: anyone? exhaust questionPosted: Thu Apr 07, 2011 6:34 pm Comanche Addict Joined: Tue Jun 16, 2009 5:52 pm Posts: 655 Location: Gettysburg, PA I know on a stock MJ the pipes are 2 1/4(2.25) all the way thanks. i'll run with that dave Link to comment Share on other sites More sharing options...
kro10000 Posted April 8, 2011 Share Posted April 8, 2011 Mine was 2.25 all the way :dunno: Link to comment Share on other sites More sharing options...
dakal Posted April 8, 2011 Author Share Posted April 8, 2011 thanks :yes: Link to comment Share on other sites More sharing options...
dakal Posted April 9, 2011 Author Share Posted April 9, 2011 i assumed mine was 21/2 in from the manifold. its 2 1/4 in from the manifold to the start of the cat. at the cat exit its 2 1/2 in to the tailpipe. the magnaflow i have ordered is 2 1/4 in inlet and 2 1/4 in outlet. i have a 2 1/4 in muffler so i'll buy a couple of bends and fab a side outlet. this should take care of it. Link to comment Share on other sites More sharing options...
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