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Best way? Header and a tune.
Software tune only is not enough. It can help flatten the dip a little bit and improve response, but the dip will never go away without a proper header and tune. You can reference the myriad of dyno charts and results from people throughout this forum.
In California, a new car is smog exempt for 8 years, except during title transfers. Used cars are exempt for 8 years following their model year. If you ever need to smog the car, you will have to reinstall the stock header and flash the ECU back to a stock map.
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