Salt Lake City, Utah-based Infopia said today that it has signed on HiFiSoundconnection, a provider of online car audio and stereo products, as a customer. Infopia said that HiFiSoundconnection is using the firm for search engine optimization and product merchandising strategies. Financial terms of the win were not disclosed; the firms have been working together for the last four months. Infopia provides e-commerce tools for online retailers, including tools for listing products on marketplaces and shopping comparison engines from eBay, Amazon, Overstock.com, and others.