FYI you will not need a tune if you install high flow catalytic converters on your Z you will be safe. Aftermarket high flow catalytic converters are a lot less restrictive than the Genuine Nissan stock OEM catalytic converters. Also you will not get a cel if you install aftermarket high flow catalytic converters. When I installed my AAM Competition high flow catalytic converters I did not get a cel or check engine light on my Z.
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