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  #1  
Old May 13th, 2020, 22:17
Black1990jeep Black1990jeep is offline
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Tucking up the catalyst and muffler

On the XJ how high up can the catalyst and muffler be tucked under the floor?

How tucked are yours?

I got near 2.5 inches between the floor and the catalyst. my catalyst has a heat shield on it on the top side. I am thinking of adding a heat shield between the floor and catalyst and raising the cat.

How close do you all run the catalyst to the floor board?

Thanks!
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Old May 13th, 2020, 22:52
Evan03 Evan03 is offline
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Re: Tucking up the catalyst and muffler

Do you have to pass emmisions?

I'd give muffler and cat a couple inches probably not worry about heat sheailds
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Old May 14th, 2020, 04:44
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sjx40250 sjx40250 is offline
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Re: Tucking up the catalyst and muffler

The catalyst gets really hot and needs the space for cooling. I wouldn't screw with it and I would eliminate the shield either.
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Old May 14th, 2020, 16:31
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Re: Tucking up the catalyst and muffler

After doing this on my 92, I found out that the floorboard just got too hot. My rubber mats melted and were smoking inside the XJ and I had to install heat shielding along the entire run where it was closest to the floor board.

I would not do it again...
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Old May 15th, 2020, 08:15
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IslanderOffRoad IslanderOffRoad is offline
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Re: Tucking up the catalyst and muffler

Quote:
Originally Posted by sjx40250 View Post
The catalyst gets really hot and needs the space for cooling. I wouldn't screw with it and I would eliminate the shield either.
This.

I unintentionally pushed mine up into the floor with a rock and almost set the carpet on fire driving back from a wheeling trip.
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Old May 15th, 2020, 09:14
Black1990jeep Black1990jeep is offline
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Re: Tucking up the catalyst and muffler

I guess the cat comes off for wheeling then.

I was thinking originally of adding an additional heat shield and then move the cat higher up, thinking the additional heat shield will compensate for less distance between the cat and floor board. But evidently that is not a good idea. Yeah my brand new cat gets hot, it has a stainless body and after first use of only tens of miles the stainless has turned color do to the heat, This is a california cat, so it might run hotter than 49 state cats as it is supposed to be doing more catalyzing.
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Old May 15th, 2020, 16:08
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Re: Tucking up the catalyst and muffler

Many use the double layer cooking sheets as a heat shield
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Old May 20th, 2020, 20:07
jake3240 jake3240 is offline
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Re: Tucking up the catalyst and muffler

Mine is turning into more of a trail only rig, but I replaced my cat with one of the tube shaped universal ones from magnaflow and straight piped the rest with 2.5". Everything is flush with the bottom of the unirails. The cat is tucked away near the crossmember. I had to weld in a bung for the d/s O2 sensor to keep the CEL off.
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Old May 20th, 2020, 21:42
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1990JEEPXJ 1990JEEPXJ is offline
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Re: Tucking up the catalyst and muffler

Moved mine as close as I could and used some heat shielding. Mine also isn’t a daily. So just for posterity I put a small piece of plywood on the floor inside just to stop things from getting too hot. Lol
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