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The source provides the following definitions:
Aftermarket: this revenue is generated from providing products for the global vehicle aftermarket to a wide range of warehouse distributors, retail parts stores, and mass merchants that distribute these products to customers ranging from professional service providers to “do-it-yourself” consumers.
Original equipment (OE) substrate: Generally, in connection with the sale of exhaust systems to certain OE manufacturers, the Company purchases catalytic converters and diesel particulate filters or components thereof including precious metals (“substrates”) on behalf of its customers which are used in the assembled system.
Original equipment value add: OE revenue is generated from providing original equipment manufacturers and servicers with products for automotive, heavy duty, and industrial applications.