Removing a cat IS illegal, so is gutting one. But as an owner you wont come under fire for it.
Lets dispell some myths here :
Removing a cat wont yiel 1-2 miles per gallon increase in fuel economy, and they dont restrict exhaust flow.
Problems arise when you drive the vehicle with a fuel control problem or in poor tune . Raw fuel overheats the cat and melts it down.That is a restriction. If they restricted flow and caused a 1-2 mile per gallon decrease in mileage the auto makers wouldnt use them as they have MPG requirements to keep with the EPA as well as emmisions
A healthy converter (stock) will impede exhaust less than 1 PSI at any given point of operation, idle or full throttle.
It is unlikely a "high flow" cat will yield any better performance at all. It definitely wont be noticeable by the seat of the pants.
Here is a good test for you skeptics that think cats are just stupid.
In your garage start your lawnmower with the doors closed. See how long you can stand it. Then run your car with the doors closed, I bet you will see the difference.Trust me ... cats are a good thing.
If you have problems with a plugged cat and need to gut it..so be it. No one especially me...will turn you in. In this economy money is TIGHT. You gotta do what you gotta do.
You dont want to put on a new cat to have it get destroyed anyhow as you will want to try and repair the issue that is the root cause, so you get the best performance and mileage. After repairs are made, and you can afford to....put a cat back on it....or not.
