CAT options....time to do exhaust?

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Nathan9790
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CAT options....time to do exhaust?

Post by Nathan9790 » Tue May 06, 2014 10:41 pm

Hey guys...so im throwing a P0420....CAT issues...so what are my options regarding power gains for my 2001 SE? Should i get a regular brand cat or switch to a magnaflow cat?

Also, which is overall better, a weld in or a bolt on?

thanks and sorry for all the questions

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Post by FAC3L3SS » Wed May 07, 2014 7:54 am

If you could find an OE cat in good shape, I'd go that route. It's easiest as far as bolt-on affairs. Aftermarket ones are all going to need welded in (for the most part) and your sensor still may be finicky with some of the readings.
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Post by occasional demons » Wed May 07, 2014 8:50 am

viewtopic.php?t=44915

If you go with a weld in unit, get a weld in flex joint with a 2.5" minimum ID, and cut the factory flex joint off.

viewtopic.php?t=66375


Also, for information's sake, it is illegal to install a used cat from another same, or different car. You probably won't find one in a JY partially because of this. They cannot sell you one. The value of the platinum is likely the real reason.
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Post by FAC3L3SS » Wed May 07, 2014 11:31 am

Good information OD. I knew JYs don't sell them, but never knew why. Or that there was a law on used cats. Heavily enforced, eh :lol:
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occasional demons
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Post by occasional demons » Wed May 07, 2014 12:05 pm

Well unless the cat is drastically different looking than what should be on there, and it passes a sniffer test, who is going to know?

I'd like to see an inspector prove the thing was from a different car, especially if it was from the same model and year.

There are probably not a lot of shops that will risk the fines doing it, so it is mainly a backyard thing, so it's kinda tough to regulate...
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Nathan9790
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Post by Nathan9790 » Wed May 07, 2014 8:52 pm

occasional demons wrote:viewtopic.php?t=44915

If you go with a weld in unit, get a weld in flex joint with a 2.5" minimum ID, and cut the factory flex joint off.

viewtopic.php?t=66375


Also, for information's sake, it is illegal to install a used cat from another same, or different car. You probably won't find one in a JY partially because of this. They cannot sell you one. The value of the platinum is likely the real reason.

So what should i replace that flex joint with? just another pipe? Also that high flow cat, it has an O2 sensor port yes?

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Post by occasional demons » Thu May 08, 2014 10:18 am

Replace it with a weld in flex joint.

Image

The magnaflow was a direct fit, so yes it had the 1/2 o2 bung.
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Post by Nathan9790 » Thu May 15, 2014 1:57 pm

occasional demons wrote:Replace it with a weld in flex joint.

Image

The magnaflow was a direct fit, so yes it had the 1/2 o2 bung.


how does that flex joint go on to replace the origional one? I asked my mechanic if he could do that and he said no. Should i just pull one off a junker and put it on to replace it?

Pictures of how it would be welded on would be GREATLY appreciated

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Post by FAC3L3SS » Thu May 15, 2014 3:35 pm

Why he said no I can't tell you, but what pictures do you need? Replace the existing flex joint with a new one. It's pretty self-explanatory once you look at the old one or pull the old cat off.
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Post by theColonel » Thu May 15, 2014 3:43 pm

Nathan9790 wrote:
occasional demons wrote:Replace it with a weld in flex joint.

Image

The magnaflow was a direct fit, so yes it had the 1/2 o2 bung.
how does that flex joint go on to replace the origional one? I asked my mechanic if he could do that and he said no. Should i just pull one off a junker and put it on to replace it?

Pictures of how it would be welded on would be GREATLY appreciated
Try a muffler shop ... a good one has experience fabricating custom exhaust, and expert welders ... this isn't general mechanic work.
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Post by sidepipe87 » Thu May 15, 2014 7:31 pm

I'm no Legal Larry or Ethical Earl over here, and I WILL sell you a used OEM cat with no warrantee written or implied. PM me if you're interested.
PM me for your 03+ PCM SKIM/VIN flashing needs. Neon PCMs Plus

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