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Old 10-13-2007, 11:18 AM   #5
Gary in BR
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Join Date: Nov 2006
Location: baton rouge
Posts: 840
I think those pipes would bypass the 97-99 cat.


From my understanding the o2 sensor after the cats would set off the cel, if the cats where not there anymore.
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99 TWIN TURBO Boxster 175k+ miles



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