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Originally Posted by clb0099
he told me that if you put headers in you have to extend the 02 sensor wires but if i remove the the pre-cats and don't do headers it will not set off the cel light or engine light the guy i was talking to was a gilbert. No offense but why would he give me money back on advice . He said that the pre-cats restricted the air flow and if i removed them that i would gain more hp but he didn't sell me sports cats or anything just told me that it wouldn't set off the 02 sensors.
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He wasn't trying to sell you a set of headers? The cats are part of the exhaust manifold, unless you're doing a bunch of fabrication, the only way to remove the cats is with headers.
The car's computer is looking for a difference between the upstream and downstream O2 sensor signals. If they both read the same thing, it'll throw a check engine light so I assume he's telling you to place the second sensor after to second cat? More fabrication.