Hell, we have a ITA 240sx here in the NCR that ran low 18s the last trip to VIR. That's the fastest an ITA car has gone there since Mark Carpenter set the record back in 06 in an Integra -- other than Tom and Chris back on Sunday last May who ran 17s.
Bowie won a few races here at VIR and drives the track expertly, but I'm not sure I've seen a Miata run anywhere near low 18s. Chris P., Tom H., Mark C., and Kevin R. all have done so I think in Honda products.