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Registered
Join Date: Sep 2004
Location: Northern Chicago suburbs
Posts: 1,399
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If you remove the primary cats, you will need to place the O2 sensors somewhere close to or in the headers, if replacing the stock manifolds. Unless you race the car, I think trying to fool the system isn't worth it. I removed my secondary cats and installed bypass pipes in their place. No CEL and zero problems when emission testing time comes around.
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'73 911 Frank 'n Meanie
2002 Boxster S
PCA Instructor Circa '95
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