cutting off cats a good idea or no??

[swamp_life hemi 05]

After I install headers do I need to keep the cats? Will it throw codes if I remove them??

 

[HemiBabe]

I've heard that it will throw codes for sure, (Check engine light will stay on) and that you will lose significant low end torque... I'm keep mine on when I install my LTs. I've also heard that OEM cats are better than hi-flo ones...

 

[TheSatinPumpkin]

By default you will get code(s).

 

[blk05hemi]

Yes lights will b on i have none on mine and it doesnt bother me.

 

[nim81]

You could use the non-foulers to keep from throwing codes


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[truckin151]

Can you run no cats though, do you have an inspection where you are at?

 

[Mad Cow]

Yeah I would keep the cats on.

 

[nim81]

Can you run no cats though, do you have an inspection where you are at?

I'm pretty sure it's federally mandated to have catalytic converter on your vehicle


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[TonkaTruck]

really??

I'm pretty sure it's federally mandated to have catalytic converter on your vehicle


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I'm sure i could point out atleast handful of things your breaks state law on.


To the OP i have ran mine with stock, long tube installed with no cats, and long tube with high flow cats. Yes you will throw a code without them, but if it bothers you that much get a DSP and have a custome tune made problem fixed no light to look at. Most would say thats overkill just run the cats, but it can be done.

 

[truckin151]

I'm pretty sure it's federally mandated to have catalytic converter on your vehicle


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Yes, it is a federal law to have them, in all actuality its is against the law to touch them move them from stock location, or replace them with a highflow cat unless it goes bad and a certified shop does the work on them and submitts the proper ppaperwork.... HOWEVER, in some states there is no vehicle inspection for emissions. If you live in one of those states you can run LT's with or without cats because all they do is check via the computer if they are working correctly, and other than that just don't get caught. If you live in an inspection state you simply can't run them unless you have a set of legal shorties and cats to swap out once a year. So to the OP, does your state do an inspection during an emission test or do they just plug into the OBDII port and check for codes? That will determine if you can run them at all.

 

[swamp_life hemi 05]

Yea ill leave them on, Florida doesn't have annually checks for emissions so I could get away with it but I want the most power and clarity in the sound of the motor

 

[RubberFrog]

on, unless you just want an uncontrolled blarbling sound

off is a high revving track only mod

 

[KGBIGCOUNTRY]

Leave em on or go to high flows

 

[weedahoe]

Ive got pacesetter LTs with no cats, x pipe with dual cutouts, dual magnaflows ans tips. i use non-foulers and have no CELs.

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