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Old 09-21-2013, 03:19 AM   #1
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Gutting cats.

I was thinking about gutting the cats on my 2005. I have borla atak axle backs. Just wondering what you guys think.
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Old 09-21-2013, 03:29 AM   #2
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very good idea !
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Old 09-21-2013, 07:45 AM   #3
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Should it sound decent?
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Old 09-21-2013, 06:52 PM   #4
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Just remove them?
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Old 09-21-2013, 09:19 PM   #5
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Just remove them?
People gut them to give the appearance of them. Thats what I have and it looks like a stock h pipe
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Old 09-21-2013, 09:29 PM   #6
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People gut them to give the appearance of them. Thats what I have and it looks like a stock h pipe
Because of inspection or something ?
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Old 09-21-2013, 09:32 PM   #7
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Because of inspection or something ?
Yes a lot of places only do a visual inspection. And some cops will be jerks and look
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Old 09-21-2013, 09:36 PM   #8
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Yes a lot of places only do a visual inspection. And some cops will be jerks and look
Ahh I see lol, clever
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Old 09-22-2013, 09:28 AM   #9
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Exactly what I have. I went to get inspected and when they did the emission testing part I passed and then they looked said I didn't have cats and failed me. Bought some cats off of AM had a guy gut them and put them in and sounds no different

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Exactly what I have. I went to get inspected and when they did the emission testing part I passed and then they looked said I didn't have cats and failed me. Bought some cats off of AM had a guy gut them and put them in and sounds no different
Well since you haven't heard your car catless it will sound different. It will be louder and meaner like having an O/R mid pipe.
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Old 09-22-2013, 10:41 AM   #10
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Are there any power gains?
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Old 09-22-2013, 10:55 AM   #11
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Are there any power gains?
Not really anything noticeable. Just sounds 100x better.
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Old 09-22-2013, 09:00 PM   #12
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Not really anything noticeable. Just sounds 100x better.
Deleting the cats will certainly add power!
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Old 09-22-2013, 09:04 PM   #13
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Deleting the cats will certainly add power!
You have to have "more than stock power" to actually notice it. You wont see big gains until you get over 400
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Old 09-24-2013, 11:43 AM   #14
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Will gutting the cats make your car too loud where cops will pull you?
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Old 09-24-2013, 02:13 PM   #15
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Will gutting the cats make your car too loud where cops will pull you?
No. If you have mufflers on it you wont ever get stopped. If you run no cats no mufflers there is a chance but thats how my old car was and I never got stopped.
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Old 09-24-2013, 02:22 PM   #16
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Will gutting the cats make your car too loud where cops will pull you?
All depends on the area.
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Old 09-24-2013, 04:55 PM   #17
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If you're having a lead foot that day and fly by a cop having a bad day he could be a dick and pull you over.
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Old 09-24-2013, 05:45 PM   #18
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Exactly what I have. I went to get inspected and when they did the emission testing part I passed and then they looked said I didn't have cats and failed me. Bought some cats off of AM had a guy gut them and put them in and sounds no different

---------- Post added at 08:28 AM ---------- Previous post was at 08:27 AM ----------


Well since you haven't heard your car catless it will sound different. It will be louder and meaner like having an O/R mid pipe.
You have any problems with a "check engine" light? I also wonder about a significant drop in mileage. The reason I ask is... I gutted a truck cat once because the honeycomb guts had crumbled and it sounded like gravel churning. I soon noticed a check engine light when pulling off a highway to stop. The cat cooled quicker than normal, and the light came on. I also noticed higher fuel consumption. I assume the gutted cat wouldn't stay hot, so the computer dumped in more fuel to try heating it up. The tailpipe stayed black and fuel smoke was visible until I replaced the cat. After that, everything was normal again.
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Old 09-24-2013, 05:49 PM   #19
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You have any problems with a "check engine" light? I also wonder about a significant drop in mileage. The reason I ask is... I gutted a truck cat once because the honeycomb guts had crumbled and it sounded like a gravel churning. I soon noticed a check engine light when pulling off a highway to stop. The cat cooled quicker than normal, and the light came on. I also noticed higher fuel consumption. I assume the gutted cat wouldn't stay hot, so the computer dumped in more fuel to try heating it up. The tailpipe stayed black and fuel smoke was visible until I replaced the cat. After that, everything was normal again.
The check engine light isnt for the cat not being hot or it being too hot.... it would be on because the computer reads more exhaust gases in the downstream o2 sensor. If you dont tune your car for it then yes you can use more gas but if you tune it then I will stay the same or get better. Black and fuel smoke would be because the stock tune on the car being to rich.
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Old 09-24-2013, 05:54 PM   #20
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The check engine light isnt for the cat not being hot or it being too hot.... it would be on because the computer reads more exhaust gases in the downstream o2 sensor. If you dont tune your car for it then yes you can use more gas but if you tune it then I will stay the same or get better. Black and fuel smoke would be because the stock tune on the car being to rich.
Thanks. The truck was a '94 model and was stock chipped. I never actually understood what the technical reasons were for the light and fuel smoke. All I knew was, gutting the OEM cat caused the problems and an aftermarket cat solved both problems.
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Old 09-24-2013, 05:55 PM   #21
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Thanks. The truck was a '94 model and was stock chipped. I never actually understood what the technical reasons were for the light and fuel smoke. All I knew was, gutting the OEM cat caused the problems and an aftermarket cat solved both problems.
Im running no cats on mine and I have no light or loss in fuel lol but I have a rich setup on my car
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Old 09-24-2013, 06:30 PM   #22
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Yeah I don't have mufflers but I'm thinking about doing it anyway
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Old 09-24-2013, 06:46 PM   #23
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Yeah I don't have mufflers but I'm thinking about doing it anyway
It will sound like garbage to me personally... its too loud for a daily driver.. I had it on my 2v and loved it but the tone was terrible...

---------- Post added at 07:46 PM ---------- Previous post was at 07:46 PM ----------

You will definitely be noticed by everyone including cops lol
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Old 09-24-2013, 07:08 PM   #24
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I gutted mine today and started it with no mufflers and took her for a drive. Came back and put my mufflers back on. Way too loud for my taste without them.
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Old 09-24-2013, 07:09 PM   #25
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I gutted mine today and started it with no mufflers and took her for a drive. Came back and put my mufflers back on. Way too loud for my taste without them.
Sounds terrible too.... lol
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Old 09-24-2013, 07:16 PM   #26
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It dont sound too bad. To me
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Old 09-24-2013, 07:18 PM   #27
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It dont sound too bad. To me
Its not bad when you are full throttle but just cruising it is distorted and the tone is off
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Old 10-01-2013, 04:07 PM   #28
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Im running gutted cats, set up with FR500's and it sounds really nice!
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Old 10-11-2013, 03:10 PM   #29
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Here is what mine sounds like. (Didn't break any laws, STAFF, lol!)

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Old 10-13-2013, 07:30 AM   #30
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Here is what mine sounds like. (Didn't break any laws, STAFF, lol!)

Sounds good and rides good! I have bassani on mine and it is noisy under full throttle.
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Old 10-13-2013, 08:12 AM   #31
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I have one question: how would I go about gutting my cats? I have a few ideas how, but I just wanna see if anyone mentions an easier way.
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Old 10-13-2013, 08:36 AM   #32
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I have one question: how would I go about gutting my cats? I have a few ideas how, but I just wanna see if anyone mentions an easier way.
You take them off, once they off you can cut them in half and get all the mesh type metals out. After that you weld them together and put them back. Orrrrr you can just put a pipe there and sell your cats to a scrap yard for 100 bucks or so. Then you will have a free offroad mid pipe
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Old 10-13-2013, 09:01 AM   #33
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Ha, I've had a set of cats for almost a year that I can't sell to save my life. As for the gutting method, that's what I was thinking just making sure that wasn't the hard way.
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Old 10-13-2013, 09:30 AM   #34
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Ha, I've had a set of cats for almost a year that I can't sell to save my life. As for the gutting method, that's what I was thinking just making sure that wasn't the hard way.
I did it before were I just took them off and beat the living daylights out of the inside and it didnt get all the metal so that way doesnt work too well. But all you gotta do is go to a scrap yard
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Old 10-13-2013, 09:36 AM   #35
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I've called several in my area and none of them will take them.
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