I can tell you that a BP twin scroll kit will run about $9,300 going from a bone stock Z to boosted/installed/tuned by a capable shop (oil cooler included in the price)
The price does not include an exhaust system purchase and install. There are other things to consider though, things like gauges (not included in any F.I kit), possible clutch upgrade, and tires to put the new power to the ground.
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