There are a few models with electric pumps to vacuum the servo. No idea what kind of system they have in place for wiring tho Also, is your current pipework fitted with a one way valve to the servo feed?
Volvo's like the V70 often use an electric vacuumpump to assist the engine. These pumps use a vacuumswitch in the hose to the brakeservo and if the vacuüm passes a certain level it switches on the pump. Very nice simple system.
I use one in my giulia as i have no vacuumpump on my engine due to spacelimitations. Works perfect.
I've seen some yanks that use them as well on tuned v8's with the same low vacuüm situations. BMW M3 V8 had one as well i think.