With just a CBE the cost of a Uprev tune would not justify it being close to stock the gains would be very minimal and would be a waste of funds as you would only have to retune your Z choosing to add future modifications.ECUtek tune would be the best route. Wait to tune after you get some modifications on your Z unless you plan on just keeping your Z close to stock. I have seen my share of dyno tunes over the years and a ECUtek tune would provide some really nice gains for naturally aspirated.
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