I would avoid a place that's in a position to try to sell you any and everything that could be related to an emissions problem.

Emissions inspections are nothing more than a license to steal.

The "test-only" sight isn't going to make anything more than their inspection fee.

The repair shop is going to fail the car in order to sell you 10 things you don't need and half what they charge you for won't get replaced. Goes on all of the time unfortunately.