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Catalytic Converter Removal ? ?

Late model cat removal?

Catalytic Converter Removal ? ?

Postby fastshelly [OP] » Nov 20 2010, 5:49am

Anyone removed catalytic converter on the newer 2008 - 2011 trucks with 5.3 engine? Will it trigger Check Engine Light?
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Re: Catalytic Converter Removal ? ?

Postby aksierra11 » Nov 20 2010, 5:59am

The newer cats are high flow, why are you wanting to remove them? I don't think you would gain much performance or MPG. If you were pushing a lot more HP out of the motor you might see a benefit.
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Re: Catalytic Converter Removal ? ?

Postby koolz71 » Nov 20 2010, 7:07am

not to mention you will void any warranty issues..that will always trace back to the cat..they will find a way
Crap, my hampster fell off the wheel and it broke its leg.

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Re: Catalytic Converter Removal ? ?

Postby fastshelly [OP] » Nov 20 2010, 7:40am

Thanks for the info guy's, I was just curious and a little old school, I didn't know the newer trucks had high flow cats . I had a Titan before it had 4 cats, when you removed the secondary cats it improved performance & MPG.
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Re: Catalytic Converter Removal ? ?

Postby aksierra11 » Nov 20 2010, 7:44am

fastshelly wrote:Thanks for the info guy's, I was just curious and a little old school, I didn't know the newer trucks had high flow cats . I had a Titan before it had 4 cats, when you removed the secondary cats it improved performance & MPG.

No worries. Lol I wondered the same thing and actually asked my local shop about it and he gave me the info.

I also was thinking old school where it was a common thing to do.

Another down side would be emissions, not sure if you have to get your truck tested where you live but you would never pass with them off.
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Re: Catalytic Converter Removal ? ?

Postby Z15 » Nov 20 2010, 1:26pm

I have not confirmed this but I was told Federal law prohibits removal or replacement of a properly functioning O.E. converter.
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Re: Catalytic Converter Removal ? ?

Postby EKinMN » Nov 20 2010, 3:17pm

They certainly prohibit it up here in MN. They have stopped doing the annual testing, but the law is still on the books. That's a big "no-no".
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Re: Catalytic Converter Removal ? ?

Postby aksierra11 » Nov 20 2010, 4:46pm

Z15 wrote:I have not confirmed this but I was told Federal law prohibits removal or replacement of a properly functioning O.E. converter.


EKinMN wrote:They certainly prohibit it up here in MN. They have stopped doing the annual testing, but the law is still on the books. That's a big "no-no".

Think its the same way up here unless the vehicle is over 20 years old.. or maybe it was 25..

I don't have emissions in the city I live in but if I ever moved to the main city I would have to pass emissions.
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Re: Catalytic Converter Removal ? ?

Postby adams99z71 » Nov 27 2010, 7:35am

fastshelly wrote:Anyone removed catalytic converter on the newer 2008 - 2011 trucks with 5.3 engine? Will it trigger Check Engine Light?


i recently removed both cateletic converters on my 99z71 with the 5.3 v8.
i "felt" a little more torque at the low end and "seemed" to pass people easier, i would not recomend removing them, it will trigger the check engine light and yes its illegal in all states(i dont have to smog,hehe). i put a classic flowmaster 40 series on her right before removing the cats and she was alot quieter before removing them. ive heard you can get spark plug defoulers for the o2 sensor to keep the SES light off but the ones i found wouldent fit, also you can put a resister in the o2 sensor wire to keep the light off.
nbs99 z71 325ci v8, stock 4wheel disc brakes, no cats, flow master classic 40 series, rhino line, custom fog lights, cb, bully dog tunner, 4:10 locker, airbag load leveling, 205,000miles.
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