The ATP vacuum source block flange adapter for Mini Cooper Turbo S features a 1 bolt mounting design.  It allows for piggyback installation into the factory MINI MAP sensor flange at the intake manifold.  This uncomplicated bolt-on will give you a vacuum source for boost/vacuum gauge with no drilling to your intake manifold. It can also be used as signal to actuate a blow-off valve.

This is the easiest, most foolproof, and most affordable way to add a boost gauge or aftermarket blow-off valve to your car.  It's a well designed part that we really like here at DoS.