Abstract: A method and system for configuring an automotive emissions-control system via the Internet. A user submits an emissions-control system profile which includes fluid flow conditions, substrate parameters, and canning conditions. The supplier Web site system receives the emissions-control system profile and performs a pressure drop calculation, transmitting the results to the customer computer. If pressure drop results are within the range targeted by the user, the user selects that the customer system send a request to the supplier Web site system to provide a selection of all the products from the supplier's product database which satisfy the pressure drop conditions. The user then requests additional information on a specific product or on placing an order. The supplier Web site system directs the request to a supplier representative for processing.