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Removing catalytic converters

Removing catalytic converters

Postby miamidolfan3524 [OP] » May 18 2012, 5:56pm

hey how yall doin, i have 2000 chevy silverado 1500 v8 4.8l with 177,xxx miles. my cats have this rattleing noise when i accelerate. i know that its just pieces of metal in the cats making that noise with the help of vibrations. i want to replace them and get new but its kind of pricey. ive been hearing from the guys in my shop about just cutting off the cats and welding a pipe in place.

what will that do to do the noise of the truck? (i have a stock exhaust from head to toe)
will i get more horsepower?
will my gas mileage go down?

thank you, patrick
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Related Topics  Catalytic converters   Stupid Catalytic Converters   Spun Catalytic converters   Catalytic Converters, Best Brand and Configuration   Got a question about removing a catalytic converter in 4.3   Catalyitic Converters   Clogged Catalyst Converters & P0101   Have a catalytic conveter going out   Catalytic Converter Problems   Catalytic Coverter 2004 5.3 help   Catalytic Converter Bolts   electric cut out before catalytic converter   Catalytic Converter problems, Cut it off? Put new ones in?   Catalytic converter removal.. Pros and cons 
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Re: Removing catalytic converters

Postby ASTE25 » May 18 2012, 9:23pm

It's not a good idea to remove the cats. If you do it will make the noise level change a little, not so much louder, just different. I would put new ones on it. If you don't you will probably have a check engine light come on and stay on due to a code being set.
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Re: Removing catalytic converters

Postby Saltwater Cowboy » May 18 2012, 9:33pm

You have to get someone who can turn your O2 sensors off or a cheater box. The box sends false signals to the O2 sensors. I had a custom tune, no cats and custom exaust and increased my MPG by about 4 but it was fairly loud and I am glad my new truck has stock exaust.
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Re: Removing catalytic converters

Postby rodcheapo » May 18 2012, 11:01pm

Does your area require an emissions check? You might go from a rattling noise to a very silent truck that is no longer street legal....

To Jordan's point, I wouldn't be surprised if this throws an error code due to back pressure issues on a newer vehicle.
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Re: Removing catalytic converters

Postby miamidolfan3524 [OP] » May 18 2012, 11:25pm

there is no emissions check where i live
2000 Chevy Silverado 1500
V8 4.8L
6in Rough Country Suspension Lift
35in Toyo Open Country M/T
22in Rims
Flowmaster 40 series
Spectre Cold Air Intake
1600 Watt amp/subs, 300 Watt amp/mids and highs
Windshield, tailights, headlights, turn lights tinted
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Re: Removing catalytic converters

Postby Saltwater Cowboy » May 18 2012, 11:58pm

rodcheapo wrote:Does your area require an emissions check? You might go from a rattling noise to a very silent truck that is no longer street legal....

To Jordan's point, I wouldn't be surprised if this throws an error code due to back pressure issues on a newer vehicle.

It won't throw a code because of back pressure, only regarding the O2 sensors. The truck I had this on was a 2001 GMC 1500HD with a 6L so I was after every once of fuel economy I could get.
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Re: Removing catalytic converters

Postby ASTE25 » May 19 2012, 3:57am

The light will come on because the converter efficiency will not be within specifications.
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Re: Removing catalytic converters

Postby evidica » May 23 2012, 1:00am

Aside from the O2 code being thrown, I know some GM engines require back pressure to run properly. Expect to need a tune in order to run at optimum levels if you delete the cats.
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Re: Removing catalytic converters

Postby apache30 » May 23 2012, 6:02am

All my friends that cut their cats off have lost fuel mileage. I think it is because of the loss of back pressure, which causes you to lose low end torque, so you have to achieve higher RPMs to get going. Someone correct me if I'm wrong, but that's my thinking. Also my buddies didn't buy tunes or anything. They just wanted to set off car alarms all across the Wal-Mart parking lot :lol:
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Re: Removing catalytic converters

Postby evidica » May 23 2012, 6:20am

apache30 wrote:Also my buddies didn't buy tunes or anything. They just wanted to set off car alarms all across the Wal-Mart parking lot :lol:

Which in my opinion is the dumbest thing to do. If you're doing it for the noise factor, budget a tune in, otherwise, don't even do it.
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