Removing Catalytic converters 2001 Tundra

Does Anybody know if removing the cats kicks a check engine light? And also would it make it impossible to pass smog/emissions?

 

Yes to the check engine light and yes you WILL fail emissions testing as you will have no emissions on the vehicle.

 

Possible, yes. There are ways of not having it trigger a check engine light but these are for "offroad only" since having a catalytic converter is a federal law I believe for road vehicles. You won't pass emissions or a smog test unless the techs are dumb, or, you are paying them to be dumb.

 

I have a set of cats from an 04 that might help

 

Thanks guys. I ended up taking it into a muffler shop instead of doing it myself. They said that i shouldn't remove the cats because it would kick a light and the truck wouldn't run properly because the engine needed the back pressure at its current tuning. Thanks for the answers though guys.

 

Of course a muffler shop will say that. If you get the downstream o2 simulators it will be fine. Backpressure is not factored in tuning its incoming air. We have done cat delete's on everything including S/C Third gens with headers. It will defenitly get louder.

 

It was nice before 1996 when you can just gut out your Cats and get away with it. Jap cars mostly because they run clean already. So one thing I hope to learn hear is how to put dual exhaust on a 2000, V8 and be able to gut the cats. If I have to leave them, then at least dual exhaust with some more flow. I don't know about you guys, but I'd rather breath gas fumes than Sulfur. Isn't Everything living made from carbon, so go figure.

 

Get some 02 simulators or if you want to be really ghetto you could attach the 02 sensors somewhere outside of the exhaust stream.

 

Thanks, I will look into those.

 

Yes I was wondering about deleti g my cats, I have p0420 code. What to do,

 

Many states do not have emissions testing. Yes, you will throw a light unless you modify your o2 sensor circuit.

 

My service engine light is on due to the catalytic converter, but since it is a 2000, there is no state emissions requirement here in Massachusetts on vehicles that old; so it has passed inspections the past 4 years... no issues...

 

Have you tried swapping O2 sensors?

 

O2 simulators will help to trick the computer, but if a smog guy happens to notice on a visual you'll get busted.

 

Yeah I had my 02 sensors changed so they r new

 

Has anyone gutted their cats? I remember I busted the honey comb stuff out of my old 93 Toyota pickup but don’t know about these 4.7 trucks.

 

i plan on running no cats.. i ran no cats in my tacoma with o2 simulators. truck was alot happier. but it was louder too. no real benefit to running catless with stock exhaust manifolds though.

 

Uncle Tony says back-pressure is a myth...


https://www.youtube.com/watch?v=A2G1EOB4P3w

 

That's a great video -- he explains the process very well. But note what he says at 4:30 about the importance of velocity. A larger, more free-flowing exhaust doesn't necessarily net more power or efficiency. The same is true on the intake side. Velocity and timing of the intake & exhaust charge are the real art of tuning.

 

I did a ton a meditations on tuning back about 2 years ago. From what I remember, Toyota has a code on our ECU that won’t allow tuning. I wish we had that code as it seems easier (le$$) to do a tune than do all this exhaust work.

 

You can tune a 2nd gen ECU, but you can't tune a 1st gen.

Sad but true... that's why I have left the intake & exhaust on my '02 stock.
I did replace the cracked exhaust manifolds with JBS shorties, but most say that's not an upgrade.

 

What did your honeycomb stuff look like when you busted it out? Did your truck run any different afterwards?

 

Uncle Tony is correct if we are talking about pre-ECU engines, but the situation changes when an ECU is in control and back pressure something you do not want to eliminate on a Tundra.

 

Only benefit I can see of deleting cats, on the performance side for our trucks, is the ability to use racing oil which has high levels of good stuff for our engines. Racing oils will damage catalytic convertors because the ‘good stuff’ clogs them up.

 

It looked like if you take a piece of cardboard and hold it vertical and looks down into it and you can see all the ridges. Or just like grey honey comb chunks once I busted it all out. The truck seemed to be louder and on that particular truck I did pick up about 1mpg.

 

A tad louder? Or real loud louder?

 

Well I had a flowmaster 40, but I would rate it a tad for sure but nothing crazy.

 

05-06 have been cracked. But that’s the only ones I know of.

 

Cracked by whom?

 

Orange virus apparently has cracked those Ecus.