* Location: Insurance rates differ drastically by state and even zip code.
* Driving Record: A clean record (obviously nonexistent for a new driver) will be much cheaper than even one minor infraction.
* Insurance Company: Different companies have different pricing models and risk assessments.
* Coverage Levels: Comprehensive and collision coverage (which is strongly recommended) will be far more expensive than liability-only.
* Vehicle's Value: A GTO, especially a classic or muscle car version, is likely to be more expensive to insure than a newer, less valuable car. The repair costs for damage are higher.
* Use of the Vehicle: Is it for daily commuting, occasional use, or mostly just weekends?
Expect to pay several hundred dollars per month, possibly even exceeding $1,000 per month in some situations. It's realistically likely to be one of the most expensive insurance policies possible. Many insurers may be reluctant to insure a 16-year-old in such a powerful vehicle.
To get an accurate estimate, the 16-year-old (with a parent's help) should get quotes from several insurance companies directly, providing all the relevant information.