I haven't had anybody install anything on my car but myself, including painting.
DDE Gen V
///M Mirrors (and paint)
Reiger Front Bumper (and paint)
Molded ACS Rear Add on
Eisenmann Quad exhaust
Interior trim swap
Rolled fenders for wider wheels
Suspension, swaped front and rear springs
Navigation unit and custom faceplate.
Made Rearview mirror with stealth PDC and LCD screen
those are the big things...lots more small things.