Get outta here.........

Really???

Nah... more like bed sores. Do you truly think that having a car suspended by four small pads with all that unsprung weight hanging on it for month on end makes no difference.

the reason folks say to not put the car on jack stands for too long is that the shocks get extended by the springs when unloaded into a place that they don't want to spend an extended period of time. i don't think it is due to the concern that the car will sag or droop. the fact that it does is indicitative of the amount of flex in the frame. if frame distortion is apparent after a month on jack stands then it should be apparent after multiple shorter applications of force (corners). hence my previous statement that the efficacy of strut bars may be related to the age/use of the vehicle.

I hate to report that after I put my order in with Mantis, they seemed to have raised the price of their adjustable bar from $135 to $175. :(

Mantis Sport Rear Stress Bar

Time to MAKE your own ??


(See what I did there ?)
:D

Ever seen a 356 with a front wheel in the air at an autocross? I have, multiple times. They're not particularly stiff chassis, from what I can see. I'm not saying a Boxster does or doesn't need one, just that going 1M miles is not really related to the question, IMO.