A product not supplied in the box by the kit manufacturer but sold for use with the kit, gene ral ly by another supplier. Decals and photo-etch products are common after-market products.

A broad term that applies to any change after the original purchase, such as adding equipment not a part of the original purchase. As applied to alternative fuel vehicles, it refers to conversion devices or kits for conventional fuel vehicles.

The marketing of the product after the DRTV campaign (DR spots or Infomercial) is generating sales. Using a combination of direct mail, internet e marketing and out-bound telemarketing, an advertiser can generate additional sales or convert leads or inquiries.