We've now released the MSPNP Pro for the '99-'00 Miatas! This is a higher end option for those who want more advanced tuning options, including rally style antilag, boost by ground speed or gear, programmable alternator voltage targets, traction control, and more! Price is $1199, just like the wire-in MS3 Pro it's based on.
Order yours here: http://www.diyautotune.com/catalog/megasquirtpnp-pro-mm9900-for-9900-mazda-miata-manual-trans-p-602.html