[BMWBig6]

Originally Posted by d1saster

X3 F25 uses spindle drives and probably is closer to the size of X1 liftgate.
http://realoem.com/bmw/showparts.do?...20&hg=41&fg=60
But you are right, without any measurements or specifications it would be shooting in the dark.

4-er GC uses spindle drive:
http://realoem.com/bmw/showparts.do?...44&hg=41&fg=60

3-er GT F34 too:
http://realoem.com/bmw/showparts.do?...44&hg=41&fg=60

I found a web site that sell linear actuators in different length. Also they sell stronger mount links.
http://electric-life.com/shopdisplay...near+Actuators

Lets say the actuator fits (the aftermarket one, not the OEM) how the control would be implemented?! Opening might be fed from the trunk lamp? What about closing? I know OEM system uses a module for control, but in our case that (probably) wouldn't be possible.

Excellent, thanks for those leads/links! You're absolutely right, even if we find an actuator that physically fits, the controls are another problem. I imagine the trunk release (triggered either from the cabin or remote control key) is only designed to supply momentary power to release a latch, so if we were to use the same circuit, we'd need to make sure 1) it could handle the Amps required by the actuator motor, and 2) could be converted to sustain power for the entire duration of opening/closing. Lots of places to go wrong. If we can't use the existing switch circuit, then I guess we're talking about installing another switch and tapping power elsewhere. Not very appealing.