I would recommend a remote tune by the other big Ecutek tuners. Eugene turkov, SpecialtyZ, etc.
Personally wasn't impressed by the tune quality of Z1's tunes on local vehicles.
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Creator of the GTR TT Conversion Kit, NA Record Holder (401WHP)
Ecutek Master Tuner (VQ37, VR30, VR38, B58, S55, S58)
BTWTuning
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