2mm Alloy blank back plate for normally aspirated use only fits Fontana plenum and Zolder 65X air box
For boosted applications we recommend;
R01SE6171 4 Cyl Turbo 4mm Alloy Back plate (max 1.5bar),
R01SE6169 4 Cyl Turbo Nitrile gasket (max 1.5bar),
R01SE6246 4 Cyl Turbo Cnc Billet stiff 4mm Alloy Back plate (>1.5bar),
R01SE6248 4 Cyl Turbo Cnc Billett Back plate O-ring seal,