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Discussion Starter #1
How can you tell if you need new cats? Do you just wait until you don't pass smog?? lol
 

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Faster than Porkchop
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Mine got toast from a miss , they got red hot and then you could hear
the internals rattling.

But for them just going bad my guess is the performance would suck and you would fail the smog.

hope this helps.
 

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Discussion Starter #5
Yeah. I'm having trouble determining a problem with my car and wish there was an easy way to identify if the cats are my problem. I talked to my dad about the problem I am having and he doesn't seem to think that it would be the cats...but I don't know!! I could be running around checking things when it is in fact the cats!!!
 

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Faster than Porkchop
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Man, sometimes it seems to me that there are veterans here that simply have heard the same questions 100 times and they just ignore them.




Just thought of something ,you could saw the exhaust before the cats to check if theres a diffrence .
But then you would have to welded them back.
 

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Discussion Starter #8
Yeah...sometimes I feel the same way here. I just wish I knew how to search better so us "newbies" don't seem so annoying. lol
 

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Discussion Starter #10

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bad cats will usally smell...didint look at the links to see what they said, but thats what ive heard, that they make the exhoust smell bad or somthing..idk just my .02
 

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leet sauce
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Lithsanatrex said:
just put set of new high flows on and call it done. easy!
Lithsanatrex's 'easy' definition :
1. Waist your money on something you might NOT need.
2. Waist more money for welding shop to install something you might NOT need.
3. Waist 2 hours of your time driving to welding shop, back and wait for them to do the job for something you might NOT need.
4. Worry about emmission tests since you already have a modified exhaust after installation of something you might have NOT needed.


thx for help friend


but what im seeing so far from the posts and searching is that there is no way to easily check unless you are willing to smell your exhaust or buy a tool that will measure the airflow.
 

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Discussion Starter #17
To measure the exhaust pressure, I used an old, but very accurate, 0-15 PSI air tire gauge that was left over from when my dad used to race dirt stock, hacked apart an old O2 sensor, removed the gauge from the tire nozzle and clamped it to 10 feet of hose, clamping the hacked O2 sensor to the other end so I can screw the hose into the exhaust between the cat and the engine. Fired the car up and looked at the air pressure. Seemed to work extremely well. Of course, at first I didn't have the hose clamp on tight enough on the O2 sensor end, so it blew off and scared the hell out of me. OH **** WHAT'S THAT SOUND?!?!?! Ohhhh, hose blew off..ahahahahaha *change pants*

If I still have it (the gauge rig) laying around, I'll take pictures of it and post here. :D
 
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