Hi, this is in the 2014 gold book, I don't think there is a B12.2.1
B2.2.1 Exhaust Restrictor. The exhaust flange restrictor as defined in the MSA homologation fiche must be in place at all times. The restrictor must be as manufactured by IAME and supplied by JME and must comply with the MSA homologation fiche, no modifications are permitted. One single exhaust restrictor gasket (part no: A-60360) must be used. The use of any additional gasket is prohibited. All exhaust gases must pass through the restrictor. As per B1.4.2, the MSA reserves the right to amend the maximum diameter of the restrictor orifice during the year, with a minimum notice period of 4 weeks.
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