from users that didnt know what they were doing when building them. I guess the biggest parts of why its not common in the z32 world is: 1 Its not Haltech nor AEM. (If its not then no one cares) 2 Its not plug and play. Most shy away when there is a little bit of wiring involved... Tearing the entire engine into atoms is not a problem tho... Before you ask, no i dont run a MS either.. :)