In a word no, not only its illegal it will improve performance try a bigger cam or throttle body or a aftermarket ECM.
It is illegal to remove a catalytic converter without replacing it. Don't cut it off, unbolt it.
Removing a catalytic converter and not replacing it is highly illegal.Removing a catalytic converter and not replacing it is highly illegal.
Yes, it most certainly can if the converter is clogged.
A OEM converter should bolt in exactly like the original, an after market may have to be cut and welded in.
Cut it with a recip saw
A shop can cut the bad converter out and weld a new one in.
No, it is illegal to remove a catalytic converter from any vehicle unless you replace it with another one.
No, it is illegal in all 50 states.
I'm pretty sure that all gasoline or diesel powered vehicles in the U.S are required to have a catalytic converter. Yes, it is illegal to remove a catalytic converter in any state.
As long as the muffler and catalytic converter are intact
Yes, and it is also illegal to remove the catalytic converter. Your engine will not run properly with the converter removed and will have less power and will use more fuel.
you can cut one of just about any car, but for what purpose for what car, for what diagnostic reason ?