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Discussion Starter #1
I have an 05 V6 Tacoma. I just noticed that the O2 sensor is located before the cat. converter- atleast 2 of the 4 are. I just wanted some opinions on any h.p. gains and if it would make any sound changes if removed. I'm not in an area where I need to pass a smog test. Yet atleast. To cut or not to cut?
 

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smokintacoma said:
I have an 05 V6 Tacoma. I just noticed that the O2 sensor is located before the cat. converter- atleast 2 of the 4 are. I just wanted some opinions on any h.p. gains and if it would make any sound changes if removed. I'm not in an area where I need to pass a smog test. Yet atleast. To cut or not to cut?

You should be a good citizen, and keep your truck smog compliant. I like to breath clean air.
 

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Obviously there is no way to find out unless you do it, but I agree with Ted, keep our air clean. If you are set on removing them, at least replace them with the high-flow variety. I doubt you will see much gain though from just taking them out and keeping the rest of the exhaust stock. Plus, the 2 o2 sensors that are behind the cats will miss-read everything, so your check engine light will come on, and your truck will probably start running real rich.
 

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Discussion Starter #4
Just trying to find some performance gains from the exhaust without being reminded that it's a V6 every time I step on the gas.
What's the best choice in mufflers to avoid the high pitch sound at higher RPM's that still has a performance advantage? (non- dune buggy sounding)
 

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Modern Catalytic convertors are really efficient, new vehicle performance suffers when they're removed. I'd bet you'll have more problems than it's worth to remove it. Not to mention your violating federal law when you remove it (clean air act).
If you visit another state you might get caught by a roadside sniffer, contrary to popular oppinion a vehicle must comply to the laws of the state it's being operated in, in addition to the state it's licensed in, so you could end up with smog violation fines.

Tim
 

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Not sure on the 2005's. URD sells a O2 sensor elim kit that works like a charm on my 2000. When installed the truck does not throw a check engine light. With an aftermarket exhaust the difference in sound is like night and day, its loud but not obnoxious it can be controlled. I did it because I was having too many problems that I thought the cat might have been causing, and once I removed it, a lot of the bogging down, hesitation problems that I was having went away. I don't condone it, but it fixed my problem. I don't have to worry about passing through any other states which is practically impossible or smog checks. It's not for everyone I would say get a test pipe made so it can be switched in and out, and only remove it when you're taking it down to the track or what not. Then again, I think the sensor problem needs to be rectified unless you want a check engine light and the possible detrimental effects that comes with it. Thats just my opinion, take it for what its worth, I won't give an opinion unless I've tried it.
 

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Discussion Starter #7
I didn't know that it would affect the O2 sensor even if the sensor was located before the cat. conv. If that's the case, wouldn't a free flow high performance converter give me the same problem?
 

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Discussion Starter #9
Post #3 had stated that they would miss-read everything and my check engine light would come on. I had done it on my 01 Tundra with no problems. Sounded a lot better also.
 
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