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post #1 of 29 (permalink) Old 09-02-2013, 11:35 AM Thread Starter
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Anyone ever here of this

I was talking with some friends last night, they were telling me that it is possible to remove the Catalytic Converters and have the mounts for the 02 sensors welded into the new pipe.
The only thing is they must be in the exact same positions. they also said that this would be a lot better as far as performance is concerned. Any thought or knowledge of this would be greatly appreciated
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post #2 of 29 (permalink) Old 09-02-2013, 12:00 PM
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maybe from a performance standpoint it would be better....from a legal standpoint on getting plates....not so much....I had a 92 mustang GT and deleted the cats and ran headers to off-road X pipe to straight thru flowmasters and it was sweet.....everytime I needed plates, I had to re-install the cats to pass emmissions....if u don't have emmissions in your state, then its ok.....Indiana has em so I had to put them back on every other year...became a pain in the ass.....
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post #3 of 29 (permalink) Old 09-02-2013, 12:16 PM Thread Starter
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That is good to know we don't have emissions here anymore. I am going to look into this further. what did you gain by doing that as far a performance or should I say what benefits could I expect?
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post #4 of 29 (permalink) Old 09-02-2013, 04:56 PM
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Would they mean same positions for the sensors be left and right?
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post #5 of 29 (permalink) Old 09-02-2013, 06:32 PM
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can always use O2 cheaters, and see what happens,, from a performance gain?? maybe a couple of horses,,
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post #6 of 29 (permalink) Old 09-02-2013, 07:05 PM
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Use 1st gen manifolds and no cats maybe?


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post #7 of 29 (permalink) Old 09-02-2013, 08:22 PM
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the main problem is this,, on a OBDII car the front o2"s and the rear ones set the fuel trim,, so naturly, if it dont read a constant unison of the O2's , it goes full rich, or lean,, not a good thing, not only will it hurt performance,, it will cost you tons in fuel waste.
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post #8 of 29 (permalink) Old 09-02-2013, 10:43 PM
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front O2's set the fuel trim, the second ones check the cat efficiency. removing the cats will give you a check engine light from the second O2's. as stated above, you might find some cheaters that will keep your cel/mil off.
advantage? pretty much nil on a stock engine, unless your cats are plugged.
most people are just too cheap to replace them if they don't have to in places without emission checks.

you can buy the bungs to mount O2 sensors in. drill a hole, weld them on.
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post #9 of 29 (permalink) Old 09-02-2013, 11:15 PM
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ya not much real "seat of the pants" difference...perhaps a few HP due to air restriction on the factory cats.....if anything, I'd install "high-flow" cats and plug in your sensors and it'd probably net the same changes.....In my 92 Mustang GT there was only one computer and it was pretty basic...fuel, shift points, abs...not much going on there...our cars are a lot different...so u may run into troubles/codes cutting them out without "tricking" the computer into thinking the sensors are still there....
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post #10 of 29 (permalink) Old 09-03-2013, 01:26 AM
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if anything, I'd install "high-flow" cats and plug in your sensors and it'd probably net the same changes.....
or better(cheaper) yet, remove the cats, replace them with straight pipe, and buy a small code reader to make sure it is only the missing cats that are setting the cel/mil.
if you don't have emissions to comply with, then it won't matter. if you want to keep the light off, them you'll need cheaters or try the spark plug anti-fouler method.
neither are guaranteed.

with the O2 sensors still in the pipe, i've seen some that set codes, and a few(rare) that don't without cats. i remove about a dozen a year, most not from a problem with the cat.
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post #11 of 29 (permalink) Old 09-03-2013, 07:38 AM Thread Starter
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Where can I find a some good high/Flow Cats???
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post #12 of 29 (permalink) Old 09-03-2013, 06:52 PM
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Borla makes some nice ones....
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post #13 of 29 (permalink) Old 09-03-2013, 08:37 PM
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My friend hacks the cats off all his cars. The difference in performance after is very noticeable. A car that would lug like crazy will throw you into the seats when it lost the cat...

Dyno would show 1-5 HP difference. Like I've been told by guys who run performance shops with dyno's, it's free horse power and torque, so enjoy.

I've heard mixed stories for our cars. Some have done it, say it works good. Others with lots of experience say it would make our engines gutless from the lack of back pressure.

You can get kits, Vibrant makes one, it comes with an adapter and three sized holes. More or less you screw your down-stream sensor into this adapter, drop in the "proper" sized hole cup in, and install it to the exhaust.

More or less it simulates the pressure/air flow of the cat being in place, computer knows no different.
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post #14 of 29 (permalink) Old 09-03-2013, 08:59 PM
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no offence, but, you think 1-5 horse will take you from lug to throw you back in your seat?
you driving a go cart?
you get more change in horsepower from barometric differences from day to day.

Last edited by hrmwrm; 09-03-2013 at 09:21 PM. Reason: clarity.
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post #15 of 29 (permalink) Old 09-03-2013, 09:15 PM
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I have a year on my 3.5 with no cats, running fine. Car feels more lively, but I did swap from a 2.7 to a 3.5, so I am guessing I am feeling the power and torque difference from the engine swap.

Only reason I ditched my cats was we were unable to get the engine to line up with the mounts and the cats, so the cats had to go!
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