The 4N6XPRT Systems 2009 update to its 4N6XPRT StifCalcs program provides: Easy access to the NHTSA Crash Test data without the need to hook up to the Internet; Display of data in Imperial and metric units; Retrieval of all tests applicable to a selected vehicle along with its "Sister/Clones;" and automatic calculation of CRASSH3 and SMAC stiffness values for vehicles based on NHTSA test data for accurate crush energy evaluation in vehicle collisions. Additionally, it allows the user to develop their own "class" of vehicle, and prints summarized stiffness data for the matching tests with the descriptive statistical data.