To install, you need: 1. A mod that removes file checking (for example, http://alexander.sannybuilder.com/Files/IV.FileCheckFix.rar) 2. Spark IV at least 0.6.3 (look for the current version here: http://code.google.com/p/gtaivtools/) 3. To tune cars with extras, use: a) inGame Trainer (http://www.gtaforums.com/index.php?showtopic=393676) b) Simple Native Trainer (http://www.gtaforums.com/index.php?showtopic=392973)