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I am in the process of replacing my manifold. I am not gonna weld it where its cracked am gonna buy a new one. I am working on a 89 4.0 L not worried at all about the old exhaust system, itll be replaced next thing front to back as i believe the cat is stopped up. And the muffler has a monster hole it. Sounded like a race car when i would get on it First question: Been searching around for a couple days looking through page after page of Aftermarket header and manifolds. Would love the Pacesetter Header!! :bowdown: http://www.quadratec.com/products/77604_701.htm?gclid=Cj0KEQjw_9-9BRCqpZeZhLeOg68BEiQAOviWAnToJbPH-5vxW46kg5PLt_olHbmCY-xh-nh__t5iPwcaAu998P8HAQ but for $233! I am gonna keep looking around. Found some good ones and then i ran across this http://teamcherokee.com/exhaust-manifold-assembly-cherokee-comanche-4-0-liter-1991-1999/ the First and sixth tube have flex joints made into them. Very cool cause this is were alot of them crack. I was Planning on doing the flex joint around the bottom near the oil pan anyways. I personally think that this thing looks cheap and is also cheaper then you can find a stock one on most sites and in parts stores... I did how ever run across this one http://www.1aauto.com/1987-90-jeep-exhaust-manifold/i/1aeem00024?f=333781&y=1989&utm_campaign=gb_csv_br&utm_content=EEM&scid=scplp1AEEM00024-333781-1989&sc_intid=1AEEM00024-333781-1989&gclid=Cj0KEQjw_9-9BRCqpZeZhLeOg68BEiQAOviWAnZjAW36YgBeYDxnpH4TpcM-DeNf6DDZ6O6kdTv65e0aArAF8P8HAQ Second question: Is a header really gonna make a difference compared to a stock manifold? If so what kind? If you guys have had any good experiences with buying a replacement manifold or a header let me know! I am open to ideas

Actually an XJ thing, but it's the same for what matters in this case. 89, Renix, 4.0L Factory exhaust is scabbed, broken, doesn't fit right, has a 'newer' catback on it that's totally rotten because it was bare steel. Anyways, Renix parts are always harder to come by, and seem to be a premium. So I was thinking I'd massage the intake and install this header: http://www.amazon.com/Wrangler-Cherokee-Performance-Stainless-Polished/dp/B00JA1BGYY?ie=UTF8&psc=1&redirect=true&ref_=ox_sc_act_title_1&smid=A1F86TF7G43XA2 Any experience with it? Reading the reviews on Amazon is mixed. The flange thickness issue is well, an issue, but it can be dealt with by making some custom washers. Obviously there also isn't a bung for my O2 sensor, but on to that... Who makes a stainless downpipe, or 'front pipe' as it seems to be called by exhaust manufacturers, that will fit an HO and have the bung in it? Failing that, does anyone know what flange style can be bolted to an HO header? These maybe? http://www.summitracing.com/int/parts/vpe-1471/overview/(they sell individually also) Is there a flare piece on Summit that will fit the needed donut gasket? Closest I think I can find is for 2.5" pipe: http://www.summitracing.com/int/parts/vpe-2599/overview/ If I have to use that (if it would fit on the header and seal) I would neck it down to 2.25" right away. I do not have any issues with front driveshaft clearance but will have trouble fitting larger pipe from there back. Unfortunately 2.25" parts seem to be much rarer than 2.5". I can buy some U-bends and make the exhaust from the header back if I know what flange and flare will bolt up. Otherwise I'm at a bit of a loss. Buying a weld in bung for the O2 isn't a big deal. I can get everything from there back easily enough if I just buy normal universal parts. Yes, I can weld stainless well enough.