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Old 01-07-2016, 06:17 PM   #1
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Removing Cats?

Hey everyone, so when freeing up the exhaust if I remove my cats I've heard that I'll lose torque but where exactly would I lose it and roughly how much?


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Old 01-07-2016, 07:53 PM   #2
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From personal dyno numbers not much of a notice. Maybe between 2-5 at the most


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Old 01-07-2016, 09:08 PM   #3
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From personal dyno numbers not much of a notice. Maybe between 2-5 at the most


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Did you lose it on the low end?


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Old 01-07-2016, 09:32 PM   #4
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Swapping out the stock pipe for an offroad one will net you some power. Comparing an offroad pipe to a good high flow catted one they are pretty much identical. High flow cats will lose you about 1whp... maybe. Obviously there are some exceptions on real fast cars but for a bolt on car its no big deal.

Also it is a federal crime to remove the cats just as a warning. Even in states where you think you'll never have to worry about it with no inspections. My buddy got a fix it ticket and a big fine in Wisconsin for running on OR pipe.
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Old 01-07-2016, 09:50 PM   #5
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Swapping out the stock pipe for an offroad one will net you some power. Comparing an offroad pipe to a good high flow catted one they are pretty much identical. High flow cats will lose you about 1whp... maybe. Obviously there are some exceptions on real fast cars but for a bolt on car its no big deal.

Also it is a federal crime to remove the cats just as a warning. Even in states where you think you'll never have to worry about it with no inspections. My buddy got a fix it ticket and a big fine in Wisconsin for running on OR pipe.
Exactly was my issue in St. Louis and thats why I just put on my catted x pipe from slp. A few months ago when I had my bbk O/R x on I got pulled over. Cop got on his knees and saw no cats on it and issued me a improper muffler ticket and a citation for a court date. Judge was supppeeerrrr nice to me and saw I took care of it by putting my stock H back on and he told me I could have got jail time and a 5-50k fine for messing with cats because it is a federal crime. Got a slap on the wrist and had to end up paying for just the ticket. Its up to you whether to risk it or not, but now that I got my catted X pipe on I actually prefer it rather than my O/R because its just about as loud but it has more of a tone than just plane raspy as hell like an old POS truck. And the notice was more high end btw than low end so launches are still nice.
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Old 01-07-2016, 09:57 PM   #6
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I've never been messed with here, but that is really interesting to hear, someone had told me that I would lose a ton of low end torque in the 2v, and I was thinking just go to a bigger gear


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Old 01-07-2016, 10:53 PM   #7
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Let me guess, he was talking all about backpressure right?
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Old 01-08-2016, 01:00 AM   #8
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Backpressure is the biggest myth out there. i don't even understand where that came from or how people even think it makes sense.
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Old 01-08-2016, 07:49 AM   #9
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Backpressure is the biggest myth out there. i don't even understand where that came from or how people even think it makes sense.
Because it came from the Internet and the Internet never lies!
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Old 01-08-2016, 02:11 PM   #10
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The backpressure myth has been around a lot longer than the internet has! Lol

I don't think that eliminating the cats will cause any loss of torque at all. As long as they are replaced by the correct sized exhaust pipe, the flow characteristics should remain the same. When the cats are "gutted" by removing the material from the inside of them, and left in place for a stock appearing exhaust system, there will be a noticeable loss of low-end torque because the exhaust will enter the large empty space inside of the catalytic convertor and begin to "tumble" rather than have a nice evenly pulsed flow of exhaust gasses exiting the system through properly sized piping.
This same loss of torque "phenomena" will occur when the exhaust system is sized too large for the displacement of the engine.
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