Factory Exhaust Restriction
- jbain
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- Vehicle Year: 1998
- Vehicle Make: Jeep
- Vehicle Model: Cherokee
Factory Exhaust Restriction
I have a 98 XJ with a Poor Man's 4.6 it has a stock head, 62mm TB, 24# injectors and a 99+ intake. The only thing I've done to the exhaust is to upgrade the CAT and install a Flowmaster. My question is does the factory restriction at the Exhaust Manifold really make a difference to my performance or should I spend the money to put in a new pipe. Also I have a factory 2000 Exhaust Manifold (without the CATS, it just has two long downpipes) and was wondering if this would be an upgrade to my factory manifold? It calls for a different gasket so I'm hesitant to use it even though my old one is cracked just because the ports might be a little different. Any help would be greatly appreciated.
- Cheromaniac
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Re: Factory Exhaust Restriction
I suggest you keep the existing '98 factory header and just upsize the downpipe plus the rest of the exhaust to 2.5" piping.
1992 XJ 4.6 I6 - 5MT - Stroker build-up, Stroker "recipes" Sold
1995 Mustang GT - 4AT - Modded Sold
2006 Mustang GT - 5MT - Modded Midlife Crisis Car
1995 Mustang GT - 4AT - Modded Sold
2006 Mustang GT - 5MT - Modded Midlife Crisis Car

- jbain
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Re: Factory Exhaust Restriction
Thanks for the response Cheromaniac.... I'll start researching available aftermarket kits.
- Muad'Dib
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Re: Factory Exhaust Restriction
Id recommend going to a local exhaust shop that does mandrel bends and have them do it. You would be hard pressed to find a "kit".
If it feels right, then STROKE it!
- Cheromaniac
- I live here
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Re: Factory Exhaust Restriction
x2.Muad'Dib wrote:Id recommend going to a local exhaust shop that does mandrel bends and have them do it. You would be hard pressed to find a "kit".
1992 XJ 4.6 I6 - 5MT - Stroker build-up, Stroker "recipes" Sold
1995 Mustang GT - 4AT - Modded Sold
2006 Mustang GT - 5MT - Modded Midlife Crisis Car
1995 Mustang GT - 4AT - Modded Sold
2006 Mustang GT - 5MT - Modded Midlife Crisis Car

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- I made it to triple digits!
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- Vehicle Model: Cherokee
Re: Factory Exhaust Restriction
I had mine done at an exhaust shop several years ago. They mandrel bent the downpipe to fit my 2.5 catback. I had given them the catback system..they made the downpipe and welded it all together for around 200 bucks...only thing is the guy said that he could not match up a 2.5 downpipe with the then..stock exhaust manifold..it would have been too big a dia and not mated properly. He had to make the downpipe out of 2 1/4 pipe...its probably just as good..no issues
- jbain
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Re: Factory Exhaust Restriction
Thanks guy's.... I really appreciate the suggestions.
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