Newby....to the 350 Z....
Last Nissan was a...gasp.... Datsun....
Anyway, 05 - 350 Z with cold air intake & stainless Exhaust, cat's removed.
What ECM module works best??
Reflash or programable type for best H.P. improvement??
Thanks,

 

With those mods I would recommend an ecu reflash. My advise would be a flash with cipher cable (so we can adjust your AFR via email), or an unlocked reflash so you can take it somewhere local and have it dyno tuned.