If you dont have intention bringing your your car to the track and only use it for dd or fun car you don't need to have it tune. But off course tuning your car would bring you the best performance gains out of your mods.
But I would certainly not want to believe you will not gain any improvements over stock for not having your car tuned. Only the butt dyno can tell you that not on the track.
To me they are just numbers if your really serious on tracking your Z invest on suspension, tires and DPE school to improve your driving skills!
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