Why 2 catilytic convertors?
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From: British Columbia
Why 2 catilytic convertors?
truck in my signature 1988 F-150 351W.
Just after the Y in the exhaust system is the first CAT I'm told. Then further downstream is the second one. I thought the first one was actually a resonator, but apparently they are both Cats , is this correct?
Where I live Im subject to emissions. My exhaust is new starting from behind the first cat? back downstream. The original second Cat was replaced with a new hi-flow unit.
So is the first upstream unit a CAT or Resonator ?
If its just a Resonator what effect will it have if I cut that out of the system and replace with exhaust pipe?
If it IS a CAT can it be replaced with the same 3-way hi flow CAT I replaced the other one with?
Just after the Y in the exhaust system is the first CAT I'm told. Then further downstream is the second one. I thought the first one was actually a resonator, but apparently they are both Cats , is this correct?
Where I live Im subject to emissions. My exhaust is new starting from behind the first cat? back downstream. The original second Cat was replaced with a new hi-flow unit.
So is the first upstream unit a CAT or Resonator ?
If its just a Resonator what effect will it have if I cut that out of the system and replace with exhaust pipe?
If it IS a CAT can it be replaced with the same 3-way hi flow CAT I replaced the other one with?
Last edited by coplin; Jun 14, 2005 at 12:38 AM.
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From: B/CS, Texas!!
The first one is the pre-heater cat. The second one is the one that does most of the work. I replaced both of them with pipe. The first one was a pain since it was dual in. Look at my gallery. Im gonna order a hi-flow one off ebay soon.
I dont know if you can replace that first one...you gotta look for a dual in cat or something.
I dont know if you can replace that first one...you gotta look for a dual in cat or something.
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Senior User
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From: British Columbia
Actually I found this link.: http://www.car-sound.com/catalog/universal/940.aspx
Since I have annual emissions testing in my area I'm not going to take a chance removing the first one even though it supposedly only reduces emissions at startup phase.. They have the dual in CAT that you mentioned too.
Since I have annual emissions testing in my area I'm not going to take a chance removing the first one even though it supposedly only reduces emissions at startup phase.. They have the dual in CAT that you mentioned too.
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