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Old 12-11-2012, 11:39 AM   #1
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Catalytic convertors

Hey guys I have a question. I am gonna put some high flow cats in my 03 but I looked underneath at my pipes and it seems like I have 4 cats. 2 are half the size of the others. Are the smaller ones a type of resonator or something of that sort?
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Old 12-11-2012, 11:45 AM   #2
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they are pre-cats...or warm up cats..same thing they just have many names lol. they basically do the job of the cats while the full sized ones are warming up to do their job.
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Old 12-11-2012, 11:48 AM   #3
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they are pre-cats...or warm up cats..same thing they just have many names lol. they basically do the job of the cats while the full sized ones are warming up to do their job.
So basically if I put high flows I need to replace them too? Or would I be ok with just deleting them?
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Old 12-11-2012, 11:51 AM   #4
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up to you..alot of people just get rid of them..some leave them. it's really personal preference in how loud you want to be
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Old 12-11-2012, 11:55 AM   #5
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up to you..alot of people just get rid of them..some leave them. it's really personal preference in how loud you want to be
If I were to scrap the pre cats would I need MIL eliminator?
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Old 12-11-2012, 12:02 PM   #6
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as long as the main cat's were still doing the job i wouldn't think so...you can always do the non fouler trick to keep the o2 sensors reading right (well 95% of the time lol)
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Old 12-11-2012, 12:05 PM   #7
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as long as the main cat's were still doing the job i wouldn't think so...you can always do the non fouler trick to keep the o2 sensors reading right (well 95% of the time lol)
What's the non fouler trick?
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Old 12-11-2012, 12:13 PM   #8
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buy some non foulers for spark plugs in the same size as your o2 sensors...then drill out the center of the non foulers with a half inch bit. unscrew your downstream o2 sensors...screw in the non foulers in your exhaust pipe...then screw the o2 sensors into the non foulers...this usually will fool your o2 sensors into believing that the cats are there and working fine even if you pull the cats.
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Old 12-11-2012, 01:10 PM   #9
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buy some non foulers for spark plugs in the same size as your o2 sensors...then drill out the center of the non foulers with a half inch bit. unscrew your downstream o2 sensors...screw in the non foulers in your exhaust pipe...then screw the o2 sensors into the non foulers...this usually will fool your o2 sensors into believing that the cats are there and working fine even if you pull the cats.
Sweet. I'll have to try that. Only the downstream O2's?
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Old 12-11-2012, 01:28 PM   #10
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yeah...downstream o2's pertain to your cats (they are mainly monitors)..the upstreams do a completely different job
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Old 12-11-2012, 03:17 PM   #11
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yeah...downstream o2's pertain to your cats (they are mainly monitors)..the upstreams do a completely different job
Sweet. Thanks a lot. I'll look into that.
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