on the td4 they are normally fitted with a bosch maf,
when u fit a synergy box i believe the pierburgh has a better design etc over the bosch one and also im under the impression that if u had a bosch maf fitted u wouldn't be able to just for a pierburgh maf without first having the synergy box
also with the synergy box u have can adjust the settings to increase etc the torque and power in stages, has a built in maf compensator that can be turned on and off and also gets rid of the flat spots lower down
it personally transformed my freelander and feels like a new car, i fitted the oem cruise control to mine and setting it on around 65 to 70 returns around 38 mpg, is very smooth, quiet etc,
may sound complicated but so many people swear by these synergy boxes and also the back up service is second to none, had mine 3 years now and wouldn't be without it now , the fitting was extremely easy and came with very good installation instructions
thks for the link and will have a look later, most appreciated
gary