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Old 01-26-2015, 06:26 PM   #1
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Running Catless

So this might be a stupid question but whatever... How many people have/know of someone getting in trouble for running catless? Did they get hit with the fine or just the referral to get emissions tested? Also will a tune affect the catless smell at all? meaning if I got a tune with an off road x pipe will it smell a little less?
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Old 01-26-2015, 07:10 PM   #2
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As far as the smell no. And I have ran catless for 15 years and not once have I even been pulled over. As for the emissions depends on the county your in some still do not do emissions testing. Most do. So unfortualy if you want to run catless keep the stock midpipe for inspeection time then take it off


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Old 01-26-2015, 07:15 PM   #3
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yeah I dont have a problem with the testing, I just am more worried about getting pulled over and getting fined or something for running no cats, I'm in NOVA and a lot of my friends I know have really loud Mustangs... although not all are cat less. I wanna get an off road h to go with my roush AB but I am just worried about getting pulled over or something for it.
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Old 01-26-2015, 07:23 PM   #4
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I think as long as you don't go next to a cop and rev I think you will be fine my cars are very loud and I take off all the time next to cops and never anything.


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Old 01-26-2015, 07:31 PM   #5
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We will see, I may just go high flow cats instead..
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Old 01-26-2015, 07:42 PM   #6
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I'm currently running a short tube header, catless X-pipe, and a Mac catback exhaust, with a custom MPT tune. You get a small gas smell on start up, but not for more than 5 seconds. I passed the last emissions test I did. I live in Houston, TX by the way.
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Old 01-26-2015, 08:20 PM   #7
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when I ran off road x pipe with pype bombs it smelled sometimes, not every second I was in the car or every light, but it did smell a bit and it was kind of annoying, but I wasn't running a tune. I have heard from some people that if you run it with a tune it wouldn't smell as much because it wouldn't be running as rich but I wanted to confirm that
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Old 01-26-2015, 09:38 PM   #8
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when I ran off road x pipe with pype bombs it smelled sometimes, not every second I was in the car or every light, but it did smell a bit and it was kind of annoying, but I wasn't running a tune. I have heard from some people that if you run it with a tune it wouldn't smell as much because it wouldn't be running as rich but I wanted to confirm that
Mine only smells for a second on start up, but I never smell it in or out of the car, idle or WOT.
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Old 01-26-2015, 10:53 PM   #9
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Not to worry

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Old 01-26-2015, 10:58 PM   #10
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Not to worry

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Old 01-26-2015, 11:05 PM   #11
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I don't have them on any of my rides and never had a problem, but if ya have to go to MV for car being too loud you're going to have to put cats on...

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Old 01-26-2015, 11:42 PM   #12
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I'm considering going cat less or high flow, I wanna see what the smell is like after a tune, gona meet up with a guy who I know who has a tuned 5.0 w offroad x pipe see how that is and make my decision from there.
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Old 01-27-2015, 08:04 AM   #13
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Another option is going cat less and switching over to ethanol (E85). Even more power and pretty much no smell.


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Old 01-27-2015, 08:08 AM   #14
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The issue is you can't just "go catless" on this car. You will most likely need a tune for that setup. It will eventually throw a light and drown the car in raw fuel.
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Old 01-27-2015, 08:12 AM   #15
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Yes it definitely needs to be tuned. ...

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Old 01-31-2015, 08:13 AM   #16
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Another option is going cat less and switching over to ethanol (E85). Even more power and pretty much no smell.


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Unless you are running forced induction, there is almost no power benefit to running E-85 on both the 5.0 and the 3.7 (also same thing with a DSP class 1999 BMW 330i, unless you consider the extra weight of the larger fuel requirement per run to be a benefit).
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Old 01-31-2015, 08:22 AM   #17
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A tune is not required but even if there is a inlet for the O2 sensor placement, a check engine light will appear. That's why people recommend a tune so that it runs better and takes that light off. As far as smell, there is a different smell. The fumes are not being trapped by the catalytic converters causing them to flow freely. Being fined from your exhaust however, depends on your location and your driving habits. If you live in a strict area and you drive frivolously, you probably will be pulled over. They can look under your car for cats, ask you what you're running, charge you for whatever etc.


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Old 01-31-2015, 08:36 AM   #18
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There is extra power to be made with E85 without forced induction, in the 20-30 horsepower range, and it is a solution if you want to go cat less and don't want to deal with the very strong smell of exhaust fumes. Going catless with a 3" mid pipe and switching to E85 with a good tune will probably get you 60hp+ on a stock car. E85 is equivalent to 105-110 octane and a significant amount of timing can be added in the tune as a result, that is where the power comes from. E85 will absolutely net the most gains in forced induction applications.
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Old 01-31-2015, 10:46 AM   #19
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A tune is needed to turn off the cat over temp protection that will flood the motor with fuel due to the mixed signals the ecm is getting....that and the eventual cel
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