As for adjusting your speedometer I couldn't tell you how expensive that would be because i'm the kinda guy who would just overlook the slight error. Here is a cool little tool at miata.net that gives you an estimate of the error in your speedometer reading http://www.miata.net/garage/tirecalc.html
To lower the car isn't that hard... You just need to get new springs/coilovers, either or. And as for the tire spring height combo that is entirely up to you... there are so many combinations u're best bet is to simply start taking measurments. _________________ If you feel like you're in control, you're not going fast enough. ~ Mario Andretti
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