Rep Power: 0

My car just recently had the CEL come on and threw a P0420 code. Now the convertor seems to make a badass noise like a loud exhaust leak.It only does it when the car is warmed up and i give it alot of gas. Even my exhaust tone has changed to somewhat quieter than is used to be. A new Cat is $200 and thats a chunk of change. So what will it hurt to run without the cat??? What power loss will i be looking at or any other problems? Or should i go ahead and buy a new cat? My exhaust now is just a high flow rear muffler without a resonator. Thanks.

 
Rep Power: 0

Buy a new cat. You will be sorry without it in a little 4 banger that is not modified heavy. You will have less low end torque than you already have.

 
Rep Power: 454

is your car still under warranty?

 
Rep Power: 300

i def. think you should get another cat. shouldn't cost that much if you go to a salvage yard.

 
Rep Power: 0

Oh, and make sure it is really your cat that is bad. I have a hard time believing it went bad that quick.

 
Rep Power: 0

Don't really know. I have a 99 Civic and I haven't had any problems.

 
Rep Power: 0

mine went so i just took out the crap from inside. now all i have to get is an o2 sim and hope it works. its just like getting a highflo cat. mine went at 20,000 i was told it was cause my header.

 
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o2 sim? What this and where can i get one? I just don't understand wtf the noise is.. It only does it when the car is warmed up, and there isn't much exhaust exiting out the rear also.

 
Rep Power: 312

i have no cat.. doesn't effect mine. :P

 
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It has got to be ****in loud with a cat and everything else straight.I have the cat off right now, and it doesn't look bad looinkg up inside it...

 
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Well guys, it was indeed the cat.. I took the cat off and the whole inside was in hundred of pieces. I don't see how the hell I was even driving my car. No biggie now, since it has all been gutted out and breaths easy now. Thanks

 
Rep Power: 0

get a high flow one. an oem honda replacement is about 800 dollars. because the insides are made of platinum. waste of money imo.

 
Rep Power: 0

here you go you will need one if to turn the engine ligh of http://www.2k1civic.com/forums/showt...ghlight=o2+sim

 
Rep Power: 0

I'll check on that o2 sim. My car is ****in loud now. I might end up getting a new cat later down the road, but for now this will have to work.Thanks everybody for the info.

 
Rep Power: 0

Go to the dealer and tell them to replace it, it's covered for 8 years and 80,000 miles under warranty.

 
Rep Power: 0

That would be good, however, My car rolled on 100,000 yesterday and I've already gutted the cat.