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Old 10-08-2013, 07:38 PM   #1
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Gutting cats

What all does it do
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Old 10-08-2013, 07:41 PM   #2
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It does exactly what it sounds like, you remove all the material on the inside so the air flows freely through. People usually do this so it looks like they have cats for inspection purposes.

---------- Post added at 05:41 PM ---------- Previous post was at 05:41 PM ----------

A lot of the time people will run a pipe through the cat, so it basically is a straight pipe with the appearance of a cat on the outside.
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Old 10-08-2013, 08:36 PM   #3
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Wow that sounds pretty cool so It will make it louder
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Old 10-08-2013, 08:39 PM   #4
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Just cut em or get an off road mid pipe and scrap your stockers for a little jingle in your pocket (unless you have emissions)
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Old 10-08-2013, 09:06 PM   #5
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Yea I have emissions
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Old 10-08-2013, 11:41 PM   #6
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Originally Posted by greenstang41 View Post
What all does it do
Nothing but make your car louder
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Old 10-09-2013, 12:29 AM   #7
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I just "hollowed" out a very large ,single exhaust, Cat on my truck.
It DEFINITELY made it louder and it does seem to be more free flowing, which is understandable if you've ever seen the "Honeycomb" material that's inside of one... HOLY COW!!!... It looks restrictive.
The exhaust sounds a bit "twangy", because now you can hear the explosions in that big empty chamber. Like Soccerluvr said, a pipe welded inside would solve that and make a better flowing exhaust system in the process.
I don't think that is the answer on our Mustangs though. Especially if you need it to pass smog. You can buy an Off Road pipe for relatively cheap and still have your intact original exhaust to put back on when it comes time for smog inspection.
It seems like most of the guys on here do that and it's the smart thing to do if you live in a "smog nazi" state like I do.
The reasons that I gutted the one on my truck are; It was already broken and rattling so I thought, what the hell. And I'm doing it as an experiment to see if the truck passes smog with it gutted.
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Old 10-09-2013, 09:00 AM   #8
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Even if you do swap miss out when it comes to emission times.
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Old 10-09-2013, 09:07 AM   #9
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Even if you do swap miss out when it comes to emission times.
Lol who even cares about emissions , I swear since I was 15 and had my 5.0 I never once ever could not get my inspection over anything at all..

I've always had loud exhaust, no cats
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Old 10-09-2013, 10:20 AM   #10
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how often do you guys need to do inspections and smog tests... here in Canada you can register and insure anything the same day. no inspection or smog needed hah can be the biggest pile of **** and its good to go
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Old 10-09-2013, 11:32 AM   #11
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how often do you guys need to do inspections and smog tests... here in Canada you can register and insure anything the same day. no inspection or smog needed hah can be the biggest pile of **** and its good to go
Here in California it varies depending on how highly populated the county is in which you live. The less populated counties only require that emissions are tested when the vehicle changes ownership. All of the rest of the counties require testing every two years. In the large metropolitan areas they do a "drive cycle" test where they put the car on a dyno.
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Old 10-09-2013, 11:42 AM   #12
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Lol who even cares about emissions , I swear since I was 15 and had my 5.0 I never once ever could not get my inspection over anything at all..

I've always had loud exhaust, no cats
If you live in any state that does a visual for cats you care about having them. Some cars can pass the sniffer without them, some can't. In NJ they just do a quick visual by rolling over a fixed camera and then plug into your OBDII port to make sure there are no codes. If you have OBD1 they still smog you here which is one reason I have a modular. Sick of having to do all the tricks to get a pushrod through the sniffer here. Although now that I have a house with a garage I could get another Cobra and register it as collector car and not inspect it. Or buy an 87/88 and register it as a classic... wow...
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Old 10-11-2013, 03:29 PM   #13
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Here they just look to see if they are there
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Old 10-11-2013, 09:10 PM   #14
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Here they just look to see if they are there
Yeah that's how OBDII cars work here too. Just keep a catted pipe on the wall to swap out on emissions day.
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