No, it does not boost fuel consumption. The role of the catalytic converter is to control the emission. Conversely, the amount of fuel that is used depends on a variety of factors including engine configuration and driving habits. So, there is no definite proof that removing cat increase fuel consumption.
It is obvious that fuel consumption is an exigent issue for car owners. For some days, I have been wondering why my car is using more fuel than usual. I thought that it might not be anything that I was doing wrong.
Later, I recalled that recently, I have removed the catalytic converter from my car to replace it with a straight pipe. So, I am thinking that does removing catalytic converter increase fuel consumption?

Will Removing Catalytic Converter Hurt Engine?
No, removing my catalytic converter may not hurt your engine. But, I have to do it by following the instructions from a mechanic. Failure to do so may result in damages. For instance, it can damage the emission control system. Plus, improper removal of a cat will increase the noise.
Catalytic converters are often removed in order to reduce emissions. While this may initially hurt the engine, it should eventually get better. It is exigent to note that a catalytic converter eliminates the harmful chemicals that were causing pollution.
I am pondering deleting the cat from my car, then I must take into account its consequence before removing the cat. But, the question is that will removing the catalytic converter hurt engine?
Can I Drive A Car Without A Catalytic Converter?
Yes, I can drive a car without a catalytic converter. However, it typically requires higher compression ratios and advanced engine technologies to do so. These types of vehicles are not for the average driver or consumer and should be treated as high-performance cars.
Conclusion
In short, I have gathered sufficient evidence that removing a catalytic converter does not increase fuel consumption. Oftentimes, it may affect the engine parts like the cylinder head and crankshaft. Conversely, removing a cat may have some benefits as well.