We now have the SuperMiata airdam in stock for the NB1 (99-00). 90-97 will be ready in about 6 weeks. NB2, (01-05) in about 8 weeks.
The design goals were, in order of priority:
1. Reduce aero drag
2. Reduce aero lift
3. Be inexpensive
4. Not destroy the front body work if it gets hit