you are indeed in for a nice surprise with your upcoming gear swap. the majority of tuners will correct the speedo. ive got a diablo chip but am saving up for a predator, much more versatile. most good tuners run $250-350, do some searching for the best deals, just make sure that the vendor has a good rep. for customer service. i would rather spend the extra $ for good customer service. good luck w/ the gear swap, you will definitately be satisfied.