Replacing front exhaust/cats? - JeepForum.com
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post #1 of 39 Old 10-08-2017, 08:45 AM Thread Starter
1longcj
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Replacing front exhaust/cats?

Getting ready to replace the front pipes. Probably go with Magnaflow but was wondering if anyone has used Fischer?


http://www.carparts.com/details/Jeep...E&gclsrc=aw.ds

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post #2 of 39 Old 10-08-2017, 09:05 AM
Mike1080p
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Originally Posted by 1longcj View Post
Getting ready to replace the front pipes. Probably go with Magnaflow but was wondering if anyone has used Fischer
Before you buy cats make sure your Jeep isn?t Cali compliant I had this issue if you put Fed compliant instead of Cali you will get engine light and your Jeep will run like crap !
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post #3 of 39 Old 10-08-2017, 09:09 AM
Mike1080p
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Walker 81861 CalCat OBDII Catalytic Converter https://www.amazon.com/dp/B00K9Z075O..._n8J2zbAK08Q08

This is what I bought and they work great!
The reason they are so expensive is the extra emission ?filtering? material I?m guessing extra precious metals forgot the type honestly... I also looked at the high flow magnaflow cats but it was almost 1k and I just couldn?t justify 1k for a cat assembly that could be made way cheaper and have better performance!
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post #4 of 39 Old 10-08-2017, 09:18 AM
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Quote:
Originally Posted by Mike1080p View Post
Before you buy cats make sure your Jeep isn?t Cali compliant I had this issue if you put Fed compliant instead of Cali you will get engine light and your Jeep will run like crap !
That is not the experience that all have. Possible you had other things going on.

IMO the bigger issue with these aftermarket units is fit. The QC on some of them can be very poor. Depending on your build and how tight things are you end up spending more money at the local exhaust shop "fixing" the fit than you save.
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post #5 of 39 Old 10-08-2017, 09:44 AM
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Originally Posted by biffgnar View Post
That is not the experience that all have. Possible you had other things going on.

IMO the bigger issue with these aftermarket units is fit. The QC on some of them can be very poor. Depending on your build and how tight things are you end up spending more money at the local exhaust shop "fixing" the fit than you save.
That and I'm not a fan of that style of flat exhaust flange. I much prefer the formed ones on the OEM exhaust. They don't deflect or bend when they get hot and the cone shape around the tube supports it better.

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post #6 of 39 Old 10-09-2017, 12:35 AM
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What's gone wrong with your converters? Any codes?

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post #7 of 39 Old 10-09-2017, 07:25 AM Thread Starter
1longcj
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No major issues. I do occasionally get p0431.
I think it's already been modified by the PO, and it's dented from being hit by the front driveshaft u-joint (also PO).


Mrblaine, so you don't like either one of these flanges?


https://www.amazon.com/aFe-Power-47-...B02NGY68VKF6M7


https://www.amazon.com/MagnaFlow-493...1KDSCFTW0YQEBC
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post #8 of 39 Old 10-09-2017, 08:17 AM
mrblaine
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Originally Posted by 1longcj View Post
No major issues. I do occasionally get p0431.
I think it's already been modified by the PO, and it's dented from being hit by the front driveshaft u-joint (also PO).


Mrblaine, so you don't like either one of these flanges?


https://www.amazon.com/aFe-Power-47-...B02NGY68VKF6M7


https://www.amazon.com/MagnaFlow-493...1KDSCFTW0YQEBC
If the 3D rendering of the last one is accurate then that is a better design.

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post #9 of 39 Old 10-09-2017, 08:40 AM Thread Starter
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It appears the OEM part is still available for about the same money. Would that be the way to go?
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post #10 of 39 Old 10-10-2017, 02:00 AM
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The Magnaflow is what I would recommend. The converters are free-flowing, all the tubing is mandrel bent, and the merges are very smooth and that increases flow. The flanges are also the formed type.

Did you want the setup with the main converter or just the two front converters?

Do you have California emissions?

You can PM me or email me at kolak@aol.com for pricing - I have excellent pricing for Magnaflow products. If you're not sure of your emissions setup, include your VIN and I'll check it out for you.

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post #11 of 39 Old 10-10-2017, 08:24 PM Thread Starter
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My build sheet says NAS 50 State Emissions. Does that make it a California jeep or would it say something else?
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post #12 of 39 Old 10-11-2017, 12:31 AM
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That would not be CA emissions. The build sheets say CA emissions if so.

If you decide you'd like a Magnaflow replacement converter assembly, please PM me here on the forum or email me at kolak@aol.com - I've got excellent pricing

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My build sheet says NAS 50 State Emissions. Does that make it a California jeep or would it say something else?

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post #13 of 39 Old 10-11-2017, 08:20 PM
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Quote:
Originally Posted by Kolak View Post
The Magnaflow is what I would recommend. The converters are free-flowing, all the tubing is mandrel bent, and the merges are very smooth and that increases flow. The flanges are also the formed type.

Did you want the setup with the main converter or just the two front converters?

Do you have California emissions?

You can PM me or email me at kolak@aol.com for pricing - I have excellent pricing for Magnaflow products. If you're not sure of your emissions setup, include your VIN and I'll check it out for you.
I have the Magnaflow mini cat setup. It is very well made and was a direct fit. No issues with codes. I highly recommend to replace all your o2 sensors with new, OEM ones.

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post #14 of 39 Old 10-11-2017, 09:27 PM
Hawk37
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I have the Magnaflow down pipe. I agree its well made, but its given me clearance issues with my passenger upper control arm. The magnaflow is a larger diameter, and doesn't fit as tightly around the oil pan as the oem pipe did. I remember it being a slight contact at stock as it got close to full droop. Its definitely more exaggerated now with my 3" lift.
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post #15 of 39 Old 10-12-2017, 09:47 AM
Mike1080p
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Quote:
Originally Posted by biffgnar View Post
Quote:
Originally Posted by Mike1080p View Post
Before you buy cats make sure your Jeep isn?t Cali compliant I had this issue if you put Fed compliant instead of Cali you will get engine light and your Jeep will run like crap !
That is not the experience that all have. Possible you had other things going on.

IMO the bigger issue with these aftermarket units is fit. The QC on some of them can be very poor. Depending on your build and how tight things are you end up spending more money at the local exhaust shop "fixing" the fit than you save.
Don?t believe I had any other problems as soon as I put a new cali-compliant cat after trying a federal compliant model my series of random misfires from 02 sensor adjustments making it run extremely lean to meet the allowable emissions range as well as getting 7-8 MPG with 33s and 4.56 gears it all went away immediately. MPG went back to 15 and the 8-10 codes I had went away no issues since then.
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