Does anyone know the difference between the G6K and G6S casting numbers on 2G heads? A G6S came off my 98 Tsi Talon and I'm being told a G6K will work as a replacement. The G6S version is hard to find. Anybody know why Mitsubishi changed to the G6S version and if there's any mods required to safely use a G6K version on an engine where a G6S came off?