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only one cat right?

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Old Aug 24, 2002 | 12:15 PM
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Type97GXE
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only one cat right?
maxs only have one cat right? my friend has a WRX and he has 3 cats. so i was wondering if we had any more than one.
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Old Aug 24, 2002 | 12:16 PM
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Re: only one cat right?
Originally posted by Type97GXE
maxs only have one cat right? my friend has a WRX and he has 3 cats. so i was wondering if we had any more than one.
We have two pre-cats and one main cat for a total of three. An aftermarket y-pipe eliminates the two pre-cats.
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Old Aug 24, 2002 | 12:20 PM
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do the pre cats actually cause a chemical reaction? would changing to an aftermarket y pipe affect emissions a lot then?
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Old Aug 24, 2002 | 12:33 PM
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Originally posted by Miasma
do the pre cats actually cause a chemical reaction? would changing to an aftermarket y pipe affect emissions a lot then?
The pre-cats are for when the car is cold and has just been started, because they warm up faster. You will still pass emissions with your main cat in place if the car is warmed up.
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