front end began sort of wobbly in spite of my tokiko suspension sys all around (new) and balanced new tires, of course aligned (laser) as well.

I said to myself wtf!! I'm only going 100. What is going on?

 

Could be anything from the level of the road, to dented rims, bad bushings, etc.

You're going at 100+ mph. Any small vibration at that speed is amplified.

And to be honest, while the RX-7 is a sports car....the car may not have been designed to travel at 100+ for extended periods of time.

 

How do you cruis at a 100 mph? Has your car ever had any front end damage?

 

You should be able to drive for an extended period at 100 mph without any problems. No one can diagnose your problem without looking at the car. It could be one of many things causing the problem. Start by checking to see that everything in your suspension is tightly bolted down. I f you can't figure it out, take it to a professional.

 

Purchased from an original owner who kept all the documents and there's no indication of any accidents other than minor dent repair on LR.

I'll check into it further and see. Thanks

 

could be harmonic interference