Probably a lot.... Especially if has a big engine....
Here's a thought, make the 19 year old pay their own insurance....
Liberty mutual company offers very low rates; if you get liability only it will be even cheaper; and, if you ask for your "deductible" (your out-of-pocket loss after accident) to be the highest offered you will also lower u rate. 1 (888) 398-8924 I AM A CUSTOMER OF THEIRS
Go on line and get a few quotes and see what it will cost.
Looking for a Used Mustang in your area?
CarGurus has 43,002 nationwide Mustang listings starting at $1,699.
Get More Money for Your CarBe seen by 20 million shoppers. Create Your Free Listing
Search Ford Mustang Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Ford Mustang Experts