c16 is leaded. I have no idea where you can get just 116 but I know it's leaded to... Here is infomation on both
Fuel Property Typical Specifications
Specific Gravity .700
Lbs./gal. 5.83
Pump Octane (R+M)/2 116
RON, Research Octane 118
MON, Motor Octane 114
Reid Vapor Pressure 6
Distillation, ºF
Initial Boiling Point 100
10% Evaporation 150
50% Evaporation 220
90% Evaporation 230
Final Boiling Point 260
Leaded Yes - off road use only
Color Red
Oxygen, Wt.% None
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.
• Color: Blue
• Motor Octane: 117
• Specific gravity: .735 at 60° F
I would either get a c16 track tune or a 100 octane track tune...