What are the pros and cons of going without a catalytic converter
#11
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Removing CATs? Is that why when I'm behind a rednecks junker, my eyes start watering, and my throat is irritated? Not to mention the stench.
#12
Senior Member
Most things still stand though. Increase in sound and especially power will be limited.
Personally I don't think it is worth the time and effort but to each his own
#13
Senior Member
Originally Posted by Gene K
Do they test 28 yo vehicles? It's not even OBD2.
EDIT: I need to clarify, that is in Texas, in counties that require emissions testing (I live in Harris county, and we're required to get emissions testing at inspection). Neighboring counties only do safety and "visual" inspection.
Last edited by bigred90gt; 02-17-2017 at 12:40 PM.
#14
Senior Member
I realize it's apples to oranges. But on my Mustang GT, removing the cats made it MUCH louder. I do have a few simple bolt on mods to go along with the cat-less midpipe, but just that alone gave me 40 HP and 50 lbs/ft of torque at the crankshaft, verified by dyno.
On our trucks, the exhaust system is even more restrictive because they aren't building F-150s for enthusiasts, they're building them for fleets and the working man. So in order to kill the noise they have more restriction in the system. Therefore I would assume large gains could be had on the trucks also.
On our trucks, the exhaust system is even more restrictive because they aren't building F-150s for enthusiasts, they're building them for fleets and the working man. So in order to kill the noise they have more restriction in the system. Therefore I would assume large gains could be had on the trucks also.
#15
Senior Member
Yea, its not like the old 70's pellet converters where you could pick up 30+hp by taking the pos off.
New high flow cats really do on provide any measureable level of degraded performance.
#16
Senior Member
#17
Senior Member
That's incorrect. Without being able to read the O2 sensors, an error code of not ready will be thrown and the test will be incomplete. The tester has to be able to read the sensor heater voltage, no sensor, no heater data.
This is why some tuners have to be returned to stock and then driven for a period of time before a test will be successful. Then after the test, return to the tuner.
#18
Senior Member
I realize it's apples to oranges. But on my Mustang GT, removing the cats made it MUCH louder. I do have a few simple bolt on mods to go along with the cat-less midpipe, but just that alone gave me 40 HP and 50 lbs/ft of torque at the crankshaft, verified by dyno.
On our trucks, the exhaust system is even more restrictive because they aren't building F-150s for enthusiasts, they're building them for fleets and the working man. So in order to kill the noise they have more restriction in the system. Therefore I would assume large gains could be had on the trucks also.
On our trucks, the exhaust system is even more restrictive because they aren't building F-150s for enthusiasts, they're building them for fleets and the working man. So in order to kill the noise they have more restriction in the system. Therefore I would assume large gains could be had on the trucks also.
Last edited by Dirttracker18; 02-17-2017 at 01:25 PM.
#19
Senior Member
Probably not true in the case of the eco-boost because of the small turbos spinning up quickly.
#20
It comes down to, do you REALLY want to challenge the EPA? They don't care who you are, and if caught, well, extreme butt hurt comes to mind. EPA sucks.
https://www.epa.gov/sites/production...hsysrepair.pdf
However, getting caught can induce major butthurt, but you have to get caught, and that is something that for the most part, never happens, unless you happened to p1$$ off an EPA agent.
Frankly, the gains, are not worth it on today's vehicles, you can replace the OEM ones with High flow ones and after market full exhaust, get HP gains and still stay compliant.
https://www.epa.gov/sites/production...hsysrepair.pdf
However, getting caught can induce major butthurt, but you have to get caught, and that is something that for the most part, never happens, unless you happened to p1$$ off an EPA agent.
Frankly, the gains, are not worth it on today's vehicles, you can replace the OEM ones with High flow ones and after market full exhaust, get HP gains and still stay compliant.