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mrbinks808 11-15-2011 08:47 AM

catalytic converter
Is it illegale to remove the catalytic converter from a truck in the state of FL?

snrusnak 11-15-2011 09:13 AM

Yes it is illegal.

mrbinks808 11-15-2011 09:23 AM

That sucks oh well

snrusnak 11-15-2011 09:26 AM

Why do you want to remove it? Not that I recommend it but FL doesn't have inspections...

mrbinks808 11-15-2011 09:55 AM

Had heard that it can improve MPG but was still doing research was just curious. Suppose it could be gutted and left in line in all is true about the fuel economy increase.

snrusnak 11-15-2011 10:02 AM

You wouldn't gain any fuel economy, at least not anything noticeable. Many people remove them for performance, but even then they are only worth a few hp at most. Today's converters flow pretty good, and I'd guess that on a diesel it'd make even less of a difference than on a gasser as diesels spin lower rpm's so the exhaust velocity would be lower. No proof here of that but just a guess. You'd likely get engine lights as well, although I'm not familiar with the diesel systems, I'm sure they monitor the converters like the gasser systems do, and you can make simulators that trick the computer to thinking the cat is still there and avoid the engine light, but IMO it's a bunch of effort to gain basically nothing, then possibly have issues with it later on.

The only time I find it reasonable to remove a converter is if it's clogged and causing issues. I don't like running without a converter, it is extremely bad for the environment and having one barely makes a difference in performance or mpg, but I had issues at high mileage with the one on my s10 so I did remove it. I wasn't willing to spend $700 on a new one for a truck worth $2,000.

GeauxHunting 11-15-2011 10:35 AM

My buddy is running no cats on his duramax and he did not get any MPG increase. I think it actually went down a little because he floors it all the time to hear it. It actually sounds awesome on his truck though.

raceram9 11-16-2011 05:57 PM


Originally Posted by snrusnak (Post 655717)
yes it is illegal.

but so are all mods to exhaust in the state of fl...but that dosent stop any one

snrusnak 11-16-2011 08:01 PM


but so are all mods to exhaust in the state of fl...but that dosent stop any one
?... all mods are not illegal. You have to have a cat in every state I'm sure. Any other exhaust mod should be trouble free from the law. Even loud mufflers, although technically illegal, you never get in trouble for them. Yeah, you can get away with no cat, but shouldn't, it is really not worth it, they are very helpful and like said hardly effect performance nowadays, and without them you also get a terrible rotten egg smell.

CdnoilRAM 11-16-2011 08:40 PM

Catalytic converters are a FEDERAL mandated emissions requirement. As such, it's illegal to remove them in ANY state, but like so many have said, people do it regardless. The performance is negligable, and unless you delete the rear O2 sensors, you will throw codes and actually decrease your MPGs as the computer is forced to compensate for the saturated exhaust gasses.

On a diesel, once you start increasing the boost levels past the stock max, you can basically throw the cats out as they do not have enough time to really do much, not to mention the fact that extreme EGTs can cause severe issues with cats followed by your turbo melting down. If you are running a chip on the highest setting and have upgraded your injectors, your cats will clog up in no time and you'll be forced to chop them out anyways.

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