Catalytic Converter Recommendations for 2008 JKU - Code 420

AJ Thanks for the additional info. I'm going to check in with a local exhaust shop to see they have any insights to work around the CA car but in AZ, although I'm not optimistic about it at this point. I have a feeling I'm going to have to pony up for some new (or maybe locate used) CARB compliant cats.
 
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Get the Magna Flow cats. Magna Flow has done a lot of exhaust system research and their catalytic converters work well. They are not cheap. We installed Magna Flow cats in the Grand Cherokee and the Wrangler. You don’t want to cheap out on catalytic converters.

There’s a way to test for bad converters, but I don’t recall how. You should be able to look it on YouTube. A knowledgeable shop can test your converters.
Are you still happy with your Magnaflow cats? Any chance you have a picture of how they fit? I installed a set of the Jegs catalytic converters on my 2008 and the crossover pipe is way too low and blocks the transmission skidplate from bolting up. Curious to see if anybody else had any issues before I drop $1500 on them.
 
Are you still happy with your Magnaflow cats? Any chance you have a picture of how they fit? I installed a set of the Jegs catalytic converters on my 2008 and the crossover pipe is way too low and blocks the transmission skidplate from bolting up. Curious to see if anybody else had any issues before I drop $1500 on them.
I've got the Magnaflow cats on my 2010 JKU, perfect fit. If it's not raining tomorrow, I can take a pic.
 
@MRGeep, photo of one side before installation. Both cats fit like factory. However, the exhaust smells odd. Turns out the #2 ignition coil has been going bad. It's fixed now.

I don't have a photo of the cats after installation.IMG_8258.jpeg
 
Thanks guys. Unfortunately for me (and any other 2007 to 2009 JK owners) our cat system is different and is a single Y piece that looks like this (MagnaFlow's version at least)... 642-49689.jpg
 
When I was looking to replace mine, Magnaflow was the only cat I found that was OEM fit

I had bought another brand and didn't fit as clean as Magnaflow
 
I'll take some pictures after install is totally wrapped up but it fits much better than the Jegs set did. The connection between the manifold and the cat pipe fits so much better and the the clamp for the crossover pipe does barely touch the transmission skid plate, so I may have to put a small spacer in but I don't think it will cost me much ground clearance. I will say that the driver side first cat does block access to the bolt on the frame side of the upper control arm, so should it need to be adjusted or replaced it will require dropping the driver's side cats off the manifold (and possibly further back as well.
 
I'll take some pictures after install is totally wrapped up but it fits much better than the Jegs set did. The connection between the manifold and the cat pipe fits so much better and the the clamp for the crossover pipe does barely touch the transmission skid plate, so I may have to put a small spacer in but I don't think it will cost me much ground clearance. I will say that the driver side first cat does block access to the bolt on the frame side of the upper control arm, so should it need to be adjusted or replaced it will require dropping the driver's side cats off the manifold (and possibly further back as well.
or flip the bolt around before full installation
 
or flip the bolt around before full installation
I was looking at that as an option, but it uses a captive nut (like the picture) inserted between the frame and the mounting location for the control arm and the bolt won't fit in. I don't think it should be too big of a deal as I don't see the need to frequently remove the bolt, but it will be a PIA when I need to.

188725.jpg
 
I was looking at that as an option, but it uses a captive nut (like the picture) inserted between the frame and the mounting location for the control arm and the bolt won't fit in. I don't think it should be too big of a deal as I don't see the need to frequently remove the bolt, but it will be a PIA when I need to.

View attachment 421377

if and when that time comes, easier to cut it off and insert the replacement from the opposite side
 
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