The SEMA Consumer Demand Index for Performance Products and Accessories (formerly PADI) measures purchase intentions of consumers (both enthusiast and mainstream) over the following 90 days. As enthusiasts represent approximately 10-15% of U.S. drivers, the Index is likely to be an indicator of mainstream consumer demand for automotive specialty and performance products.
The Consumer Demand Index is a weighted composite index, set to an initial value of 100 based on demand levels benchmarked between January and March 2007.
The September 2009 report is based on 924 interviews conducted nationwide via Random Digital Dial (RDD) telephone survey. The data resulted in a three point increase in the Index level from August, moving from 42 to 45.