What does a catalytic converter do?

I read that it causes back fire out of the exhaust, which sounds fucking badass. Does it also offer any actual mechanical advantages like more mpg. If so, how do I remove it?

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I don't run any cats because racecar. Afterfire everywhere.

>Does it also offer any actual mechanical advantages like more mpg
No
>If so, how do I remove it?
Unbolt it from the header

it converts catalytics you stupid faggot.

I'm assuming you're asking "what does removing the cat do"
Which it can give you backfires, you're right, but really only if your cars running really rich. Older cats can also get clogged and cause restrictions in the exhaust, so removing them can make the car breathe better.

>I read that it causes back fire out of the exhaust, which sounds fucking badass

It does the exact opposite. At a basic level, it's an exhaust filter. It filters out many gasses and pollutants. It's summed up in the picture you posted.

If you replace a cat with a straight pipe, your exhaust will smell much more potent, and you will get way more backfire.

I'm a dumbass with cars. What is a header?

And is it possible to create a sleeper where when I'm daily driving, the car wont back-fire, but when I actually try to go fast or hit high rpms, it'll shoot out fire?

>removing the catalytic converter
Just replace it with a highflow one

Define "running really rich" cause I'm an idiot with cars.

>remove cats
>check engine light eternally on
Is there a way to get rid of it?