> Interesting - does the MAC-11 have this feature too? > Is the 12D EFI or CIS? The MAC-12D is a MAC-11 with the emission control feedback (OXS sensor) removed and a lump of code to drive the fuel frequency valve via tables inserted. Otherwise they're identical. -- Phil Payne http://www.isham-research.com/quattro +44 7785 302 803