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Do you have to tune it? No not really for a TRD intake & cat back exhaust. Will you gain any power from bolting them on? Possibly, but minimal if anything at all. The throttle response might be slightly more crisp due to the TRD intake shifting the engine load under low load slightly advancing timing. Most of the gains you "feel" may be during the learning process and once the ecu neutralizes the gains may go away / stay. A lot of bolt on dynos show the best pull out of the car after reseting the ECU and letting it lean out / advance timing before any learning has started. So a lot of bolt on dyno's are skewed a bit... I have seen very few dyno's of a car with learning for a few tanks of fuel, then swapping parts, allowing learning for a few tanks and re-dyno with similar weather.
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