I took the 914 back to A&P Specialties yesterday to upgrade the front brake calipers with ones from a BMW320i. The brake pedal definitely feels different. I can push it a lot farther towards the floor and the pads seem to bite quite a bit more. I hope this will help with any emergency braking I might have to do.
Given the sluggish acceleration of the vehicle, I started looking into lighter batteries. Apparently, I can purchase Lithium-Iron-Phosphate (LiFePo) packs from Electric Wheels in Salem, just an hour south of here for the whopping low price of $12,500 for a 100Ah/144V pack. It would take about a 1000 pounds of the weight of the car and the pack would last many times the life of the lead acid batteries. I think I'm going to let the existing pack go out and reconsider these new batteries in a year or two. Things might get really interesting with so many new electric vehicles coming out.