This is right off their site www.vpracingfuels.com -
C12™
The best all around racing fuel made. Recommended for CRs below 15:1, satisfying the needs of 75% of today's race engines. One of the winningest fuels in racing history, including AMA, NHRA, Modified Tour, GNN, D.I.R.T. and Indy Lights, as well as other local and national championships across the U.S. and around the world.
TYPICAL VALUES
• Color: Green
• Motor Octane: 108
• Specific Gravity: .717 at 60° F
C16™
Used in turbocharged engines, blown engines and nitrous applications with CRs up to 17:1. Recommended by the top nitrous oxide companies. Spec Fuel for NHRA Comp Eliminator.
TYPICAL VALUES
• Color: Blue
• Motor Octane 117
• Specific Gravity: .735 at 60° F
I think C12 is a better choice for your banshee, but if you have to use the C16 you may want to cut it with some premium grade pump fuel to bring down the octane level some. But 200psi/cyl is alot so you will need some high octane, but not 117.
What do you have going on to have 200psi?