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  #1  
Old 03-21-2008
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Catalytic Converter

Hi Everybody. I have a 94 Ranger Supercab 4.0 w/199,900K & I need info on removing cats & installing straight pipe. We don't have vechicle inspections in the state of Ga., and this is something I was just toying with. Since both O2
sensors are before the cats I was wondering about the effects on driveability & performance! Any input would be appreciated!
Thanks,
J.Terry
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Old 03-21-2008
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i have the ?? free bump
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Old 03-21-2008
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it won't affect drivability, performance may be a little better, and it will be louder w/o the cats. if the sensors are before the cats it shouldn't throw a code and turn the c/e light on.
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Old 03-21-2008
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or you could just buy an aftermarket cat to replace yours.
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Old 03-21-2008
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Performance will be better. Just throw a pipe in there!
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Old 03-22-2008
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Orrrrr you could just keep your cat(s) and do the environment a favor.

I guess it's "anything goes" for some people though.

http://www.epa.gov/OMS/regs/im/960092.pdf
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Old 03-22-2008
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if you ever get caught you will get a HUGE ticket/fine.

have fun.
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Old 03-22-2008
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Originally Posted by 5speedin2.3 View Post
if you ever get caught you will get a HUGE ticket/fine.

have fun.
Here in MN, "tampering with or removing any Emissions control devise (s)from a vehicle will result in a $500 fine."
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  #9  
Old 03-22-2008
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if i as a professional get cought removing converters i can face a $25,000 fine and loose my certs for one year.
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  #10  
Old 03-22-2008
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Orrrrr you could just keep your cat(s) and do the environment a favor.

I guess it's "anything goes" for some people though.

http://www.epa.gov/OMS/regs/im/960092.pdf

haha so the fact that ive spent the last few days gradually installing a full race header on a 06 rsx-s makes me a bad person.... welp the end result in performance and sound is a perfectly justifyable offset for me!


id ditch mine in a second if i had anyhting but this 3.0
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Old 03-22-2008
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Why make pollution when it's not necessary? You all are just too cheap to do it right and get performance WITH a CAT -- and it can be done.

So yes, you're an uncaring person who takes the easy way out. No respect for that.

If the vehicle is race only, who cares? But it's wrong to do it to a daily driver. Period.
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Old 03-22-2008
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I took the cat off of my car and it made a TREMENDOUS difference. Not only did it sound much louder at high RPM (pretty much the same at low RPM) it gave me atleast 25 HP at the tire. I had the car dyno'ed after I did this and a few other mods and I had increased 37HP so I don't know how much of this 37 came from having the cat off but I am guessing about 25. As for emissions testing, you can use spark-plug defoulers to pull the sensor out of the flow so that the sensors will not tell the computer that the cat is missing, this is what I did and it works perfect. I can pass emissions no problems.
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Old 03-22-2008
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Right, Mr. Turbo. 25 HP from the CAT -- which vehicle by the way? And I don't believe you can pass emissions. I think you're full of...stuff.

(another one heard from...)
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  #14  
Old 03-23-2008
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Thanks for all input, negative as well as positive! Just an idea I was toying with. I made up my mind to go with a high performance cat. Any suggestions on said part?
Thanks,
J.Terry


He Who Knows EveryThing - Don't Know Squat!!!
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  #15  
Old 03-23-2008
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Right, Mr. Turbo. 25 HP from the CAT -- which vehicle by the way? And I don't believe you can pass emissions. I think you're full of...stuff.

(another one heard from...)
id assume his Evo. as for the defouler, that should only prevent the computer from throwing a cel...

and honostly, (tho not as much on our trucks) getting 10-30+ wheel hp on a single mod to a performance vehicle costing under $600 ($190 in my case) is one of the best cost to gain you an get
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Old 03-27-2008
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Why make pollution when it's not necessary? You all are just too cheap to do it right and get performance WITH a CAT -- and it can be done.

So yes, you're an uncaring person who takes the easy way out. No respect for that.

If the vehicle is race only, who cares? But it's wrong to do it to a daily driver. Period.
THANK YOU!


You're a homo Sean... and your Ranger sucks.


j/k...


... about the Ranger


... you're still a homo.
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  #17  
Old 03-27-2008
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Right, Mr. Turbo. 25 HP from the CAT -- which vehicle by the way? And I don't believe you can pass emissions. I think you're full of...stuff.

(another one heard from...)
Thats cause he is bsing....not if u gte the probe in the exhaust...and even before that it fails the visual...sooo i guess that wouldn't work out would it.
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  #18  
Old 03-27-2008
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you guys do know that some states don't have inspections right..?

theres still no reason to remove the cats unless they are plugged/broken.
i can see cutting the cats off an offroad only vehicle(IE: race car or trail beater), but thats a different story.
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Old 03-27-2008
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Originally Posted by Jp7 View Post
I took the cat off of my car and it made a TREMENDOUS difference. Not only did it sound much louder at high RPM (pretty much the same at low RPM) it gave me atleast 25 HP at the tire. I had the car dyno'ed after I did this and a few other mods and I had increased 37HP so I don't know how much of this 37 came from having the cat off but I am guessing about 25. As for emissions testing, you can use spark-plug defoulers to pull the sensor out of the flow so that the sensors will not tell the computer that the cat is missing, this is what I did and it works perfect. I can pass emissions no problems.
if he did this to his evo i can see maybe 15 hp because your making the exhuast flow better which in turn helps the turbo but i cant see 25. but who knows i only have one cat on my 94 4.0 and i don't have a muffler i love the sound of it if your going for sound just punch out the second cat there is no need for 2 cats its b.s and you will gain some performance out of it. i noticed a little better and a little better gas milage too so w.e its up to you.
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Old 03-31-2008
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I did the downpipe from the turbo back and the testpipe at the same time. And yes the defouler trick works perfect. I have been running the car this way for nearly 4000 miles with no Check engine light (no codes, so the car will pass) 37 horsepower at the tire was the measured improvement from these mods (downpipe and testpipe)
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