Then get high flow cats and be done with it. I personally have had to deal with a melted cat on my old GTO and will never let that happen again.

Your tuner can get rid of the code your car will throw, but you'll still give off a go-kart like smell. And if they sniff that or do a visual, you're not passing. Unless you know a guy.

 

What mods and power level are you at?

Its either highflow cats or no cats and find a place to be your friend

 

Also depends on where you live in Texas, but for the most part if you program out the CEL and go to a smaller shop they really don't look. With that said I just went with hi flow and called it a day. You also could go with something like TSP system with fake cats.

 

Trust me, I like the idea of not cats, but I would like to pass the emissions part of the test. I assume there is no way around that without cats.

 

I didn't know they checked for cats in Texas.
I was under the impression that you could pass running open headers there.
Is this recent?

 

I can't tell if you're being sarcastic or not. They have always checked in Dallas. I've heard you can get away with it in some of the smaller counties.

 

I was being serious.
I thought it was just an OBD2 check in Texas.
Didn't know they did a visual too.

 

its OBDII here as well, but it is supposed to also get a visual inspection

On-Board Diagnostics Generation II (OBDII) Inspection. Most 1996 or newer gasoline-powered vehicles and most 1997 or newer diesel-powered vehicles that have a gross vehicle weight rating (GVWR) less than 8,501 pounds are subject to the OBDII emissions inspection. This test examines the Malfunction Indicator Lamp (MIL), also known as the "check engine" light, for operation/illumination, and verifies the test results of the vehicle's "on-board emissions diagnostic" system.

Low Enhanced Inspection. A "Low Enhanced" emissions inspection is required for most other vehicles, unless they are subject to the OBDII test or are exempt from all emissions inspections. This inspection is required for all vehicles from and including model year 1995 and older, through and including vehicles that are up to 25 model years old, and that weigh 18,000 lbs. or less.

Each emissions inspection for gasoline-powered vehicles confirms the presence and connection of the vehicle's required emissions control devices. This includes making sure that the vehicle's gas cap is present, is in good condition, and fits properly.


The following emissions control devices are examined if the vehicle was originally manufactured with them:

Catalytic converter (CAT)
Exhaust gas recirculation valve (EGR
Positive crankcase ventilation system (PCV)
Air injection system (AIS)
Evaporative emissions control (EVAP)
Fuel inlet restrictor (FIR)
Thermostatic air cleaner (TAC)

 

Not every county in Texas requires emissions testings. It seems that only the liberal areas do LOL: Texas Smog Check and Car Inspection | DMV.org

 

I'm told that cats will only take so much power. What are your opinions on how much power it can hold?

 

I have no cats and I passed inspection with no problems. I don't believe many shops look under your car but in all honesty the guy that inspects my car put my exhaust on so he knows it has no cats. Either way the car passed all other test with no problem.

 

I live in Galveston county and they do check with a sniffer, so no cats usually fails.

But in my area at least there are multiple places that you can still get a sticker at.

If your worried about it just get high flow cats unless you make a ton of power.

 

How much power can high flow cats handle?

 

Just get two x pipes and switch out at that time of year. We do not have emission testing in San Antonio. There are 13 counties in Texas that require testing. I have no issues with mine.

 

Not too sure about that list. I've lived in Tarrant for around 12-13 years. Not once have they done emissions testing past obd2 pass/fail, and I just hit the lube places that do inspections. None of this "know a guy" stuff. This is my 2nd car with headers and cats delete.

 

In Fort Worth I never got a sniffer or a visual check on my Z06 with no cats, just OBDII. Passed for 3 years at 3 different places. As long as you don't have a CEL on I don't see why it wouldn't pass.

 

Honestly, I haven't paid much attention to inspections over the last 5 years to see who does the sniffer and who doesn't. I just remember in my old camaros struggling to pass.

 

Montgomery county here. Catless and passed inspection no problem at Simoniz in the Woodlands plus a free wash

 

It's definitely all about who you know when it comes to getting an inspection passed in Texas! Just ask the other car enthusiasts in your area who to go to. Someone will know.

 

Y’all really think removing your cats is going to give you a performance increase huh? Power and performance class at UTI shows on a dyno that it only gets you MAYBE a quarter of one horsepower increase… MAYBE. So basically y’all are risking trouble for what…..? Also in tx you must have a muffler. A lot of state inspectors don’t know that having no cats basically doesn’t do anything for you… So they may side with you in thinking that having no cats is cool and gives you mad horses…. But if they were like me they would fail every catless car that comes in because it really is stupid…. Honestly. Do you need a quarter of one horsepower? Just tune it if u want but you’re not gonna run away from the same car with a cat in a race…. Yall would literally be side by side…

 

Wow! Nice first post, rant much?

Plus, they are not saying it adds power. With the stock cats on our cars so close to the engine, adding power melts them from the additional heat.

 

Last post was 6+ years ago man.

 

Guess he/she read the title but couldn’t read the 6 year old thread . Exactly what you want in an inspector. Especially since they were mostly recommending high flow cats .

 

Im guessing this person doesnt even own a V and is just on a crusade for some reason. Proly found this thread on Google and created an account just to swing their little pee pee around.

 

Def got that fresh out of school know it all down. Curious to what car you tested and learned this absolute truth with at UTI, was it a Vespa? Instead of drinking the cool-aid, you might want to stick to cranberry juice so you can rid yourself of that UTInfection.

Sent from my SM-G960U using Tapatalk

 

Lol, imagine being that much of a cuck you create an account just to post that

 

Doesn’t matter when the account was created… you’re just getting your panties twisted because your “physics” and your fantasies have been brought to light and it’s not exactly what you thought. And it was a roush mustang with stage 2 supercharger we got it to 744 hp and 667 lbft torque. We also had a 2017 corvette z06 and a 2016 cts v. The caddy is actually the one that had the exhaust cut and had clamps ready to put in the factory cat, a hi flow cat, and straight pipe. Muffler was not present for testing due to controls for testing. Straight pipe +0.21hp, high flow cat + 0.17, factory is baseline. This was after tuning tho… but the evidence is there. I don’t need to own a cts v to post here. And yes, i do enjoy occasionally poking the bear to watch the comments.

 

You wrote:

"you’re just getting your panties twisted because your “physics” and your fantasies have been brought to light and it’s not exactly what you thought."

----------------------------------------------

Excuse me. . .But where did you post the physics
describing the test results referenced?

From a scientific perspective, you have not
even qualified your statements yet. . . .

Science includes the documentation of verifiable data.

Physics includes quantifying said science / data
via the appropriate math.

Please repost your conclusions based on the
applied physics you referenced above.

This means you need to go back to the beginning
and fully characterize the engines.

What it looks like right now is you’re getting way out over your skies, as you’re making statements based on a couple of tests, without first ‘fully’ characterizing the cars / engines / system.

Characterization of all engines would include compression ratios, bore and stroke ratios, cylinder head flow, cylinder head mcsa, header pipe sizes as well as mcsa, exhaust pipe size, as well as mcsa._And More!

From the dyno you 'at least' need to supply the peak hp, peak hp rpm, along with peak torque, peak torque rpm, as well as BSFC.

Hot-Rodding today, for the most part, deals with putting a supercharger or nitrous on the engine. Then if they like to brag about how much hp they made with the sbe, before the sbe vented the block. . .

One really does not have to understand much about an IC Engine to do that. So, up on Facebook they don’t deal with such things. . .
Here we do!

By the way. . . Facebook is where everyone goes who has a +1,000 rwHP car and describes those cars with no quantifiable data. . . Just Opinions!

Change the license plate frame and. . .
One now has a +1,000 rwHP car..LOL

If you want a Dyno Queen, simply bring a
hair dryer to the dyno session. . LOL

Come back with data which fully characterizes the car / engine / system.
Not unsubstantiated data, and / or unqualified opinions. . . .

--------------------------------------------------------------------------

Also, when was the last time you went to
an NHRA Division or National Event.

Were those cars running mufflers or cats. . NO!

If they could produce the same fwHP with mufflers or cats,
then why are they not running them?

NHRA has had to close down track after track
because of noise complaints.

Take your solution to the head of NHRA Tech.

See if you can convince him that a modified 700 fwHp car can run the same exhaust system that it did when unmodified, when it only put out half of that HP. . .

An increase in mass flow / In_Flow is required to improve HP.

And increase in mass flow will bring with it an increase in mass charge.

And what goes in, must come out, less how much
of the mass charge is burned during the 'burn angle'.

This means that if we improve cylinder fill via an increase in, In-Flow, we will be dealing with more mass flow at the exhaust valve, or Out_Flow.

And that calculation is 'exactly' how we determine the exhaust port flow required, relative to the intake port flow, when fitting a camshaft to an engine.

After the exhaust gas passes through the exhaust valve, the exhaust system must not be reduced down below the required mcsa (minimum circular square area). Pinch the mcsa a bit too much and the engine will never reach its potential HP.

Too small an mcsa along with too large an overlap triangle and
the engine will suffer from exhaust to intake reversion.

The size of the mcsa is proportional to several variables.
Most importantly would be. . . mass flow, temperature and pressure.

Cheers

 

Lol, you're not poking the bear, you're just looking like a millennial asshat. Bet they love you on FB though.

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Well, I don't know where the cats are on a 2016+ Cadillac CST-V, but on a 2009-2015 Cadillac CTS-V the factory cats are very close to the engine and when you modify the car you produce more heat and more heat melts the factory cats.