Insurance can be weird. For a while I was paying less for insurance on my 2008 Dodge Viper than I was on my 2001 Ford Mustang GT. It's all risk tables.
Insurance rates are all determined categorically. Mustangs have a higher “accident rate” because they’re cheap and fast and young people with lower incomes, who are also most likely irresponsible, buy them and crash them.
Vipers aren’t exactly in the same group. It’s not performance based, just statistics.