Something went in the motor.  I don't have time right now, or the space to rebuild/swap motor.  Motor is still in the car.  Mechanical noise, puff of smoke, and we stopped the car.  Picked it up with a trailer and put it in storage.  That is the best I can say to what happened.  I am not interested in parting it out, if I had time to do that I would just fix the motor.
Car is located in North Central Massachusetts.  
I was prepping it as a track car.  So it comes with a bunch of good stuff.
Being the S it has the 6 speed manual, bigger brakes, and 3rd radiator
10k miles ago:
new Sachs clutch
LN IMS bearing
RMS
brakes rebuilt - powder coated calipers, new rotors, stainless brake lines, full flush
sanded/polished headlamps then covered with 3M protection film
LN 2 qt deep sump
Motorsport AOS and LN bracket
transmission fluid flush
Cipher seats
7k miles ago:
K-sport coil over shocks with camber plates and spec Boxster spring rates
Tarett Engineering front and rear adjustable sway bars
3k miles ago:
New Toyo Proxes tires - all street miles so lots of life left
Car had what looked like a new convertible top on it with the glass rear window when I bought it.  It was originally a FL and SC car so there is zero rust on it.  Some body work is evident.  There are also 4 holes in the rear deck lid from a wing that has been removed.  I have a hard top and powder coated white Boxster S wheels I am planning to sell separately. 
$4750