wow man. congrats on the car, it's def. legendary.
to answer the question, it would all depend on how much more hp you want, turbos range from 100hp/$300 to 1000/$12,000. maybe even more, there's plenty of supras out there that are 1000hp or more. so it would depend on the turbo you bought. the tuning would also depend on how much needs to be done along with the installation. it's really hard to answer this with no specifics...sorry.
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