I know i have a lot of issues going on in my car. But when i had my gears changed to 3:73, the speedometer is 5 miles of. so when im going 45 im actually going at about 40-42. I seen this device on summit which can recalibrate my speedo: http://store.summitracing.com/partde...5&autoview=sku , you think that will solve my issue?

 

A tuner should be able to do it in the PCM, go talk to whoever did the dyno tune in your signature or get a mail order one tune.

Here is a supporting vendor that will do it: http://www.trifectaperformance.com/order.aspx