If you did hear this correctly, "Is it a catch?" may mean the man was asking if this was too good to be true.
For example, the car may run for 5 hours, but the "catch" would be that it has to be hooked up to a battery overnight.
The car may have a removable top, but the "catch" may be that it takes three people to take it off.
"Catch-22" is a phrase used in America to describe a dilemma from which there is no escape.
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