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Tuning cost can very...dyno tune is the most ideal, which can cost something along the lines of $300-$1000 (depending on facility and time involved in tuning).
A mail order tune can be done through a variety of vendors, the most popular (and reliable) seems to be Alvin at pcmforless.com. Otherwise, Greg Carrol at blowerworks.net can also set you up with the proper hardware and tune, not to mention support after the sale.