Ok, firstly, please don't use ALL CAPS unless you actually want people to think you are yelling - it's bad Net etiquette. Second - do you mean a Boost Leak test or a Compression test? Boost leak tester: http://www.pexcom.com.au/z32cms/e107_plugins/content/content.php?content.487 Boost leak test: http://www.boostpro.net/guidesz32basic.html Compression test: http://www.pexcom.com.au/z32cms/e107_plugins/content/content.php?content.264 http://www.twinturbo.net/nissan/300zx/forums/technical/view/868155/Compression-Test-How-To.html