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Old 06-26-2006, 02:56 PM   #1
Join Date: Jun 2006
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Bypassing downstream O2 Sensor

I just installed a borla cat back exhaust sytem on my 99' Wrangler sport. I am thinking about removing the cat converter and installing a header w/ straight pipe back to my new exhuast. However, there is a downstream O2 sensor and I am wondering if there is a way to bypass and plug. Is there a performance chip out there or anything like that. Any info would be appreciated.

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Old 07-18-2006, 11:31 AM   #2
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Is there any specific reason you need to get rid of your catylatic converter? There are plenty of high flow catylatic converters out there that will not hurt your performance and still keep you legal. I got one at Summit racing for about $60 or so if I remember correctly. Any header that you buy for your jeep will have a provision for the O2 sensor and I think that the computer needs this info from the sensor to function properly. Don't reinvent the wheel, just make it better.

87 YJ, 5.2/46RH/NP231, Custom 4 link/ Radius Arms, Ballistic Nitrogen Shocks, 35" Cooper STT
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Old 07-18-2006, 12:03 PM   #3
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exactly..DO NOT remove your catylatic stated above...there are high flow catylatic converters that will actually HELP performance and keep you legal...and besides taking the catylatic converter off can actually HURT performance...just keep your catylatic conver on there...or get a high flow one
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Old 07-18-2006, 03:09 PM   #4
coilovers are damn flexy
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The O2 sensors are pretty important to your CPU, your engine won't run very well without it.

I built a complete off road Jeep, and it has 02 sensors on it, it is a must with fuel injection.
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Old 07-19-2006, 12:32 AM   #5
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and in some states no cat means no inspection sticker means no drive on street
95 yj 4.0 4 inch bds and 1.5 shackle lift 33inch swampers for summer and 32 inch mudkings for winter 8500# milemarker winch and homemade high lift / light mount on hood

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Old 07-19-2006, 07:04 PM   #6
coilovers are damn flexy
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Originally Posted by 3jeepguy
and in some states no cat means no inspection sticker means no drive on street

Forget about legalities, it won't run right.......period.

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