10.00 to 13.99 ET; all E.T. non-OEM supercharged, non-OEM turbocharged, or nitrous-equipped cars with an OEM or .024-inch steel firewall: Jacket meeting SFI Spec 3.2A/1 mandatory.
10.00 to 13.99 ET; all E.T. supercharged, turbocharged, or nitrous-equipped cars without a full OEM or .024-inch steel firewall: Jacket meeting SFI Spec 3.2A/5 and gloves meeting SFI Spec 3.3/1 mandatory.
The spec 3.2A/1 is a single layer jacket. I suspect that is what you are going to need.