I have similar mods on my G35 sedan HR and dyno tuned my car using Uprev. I gained 20whp at peak and more than 20whp throughout the power band (from less than 3K to 7.7K). The car feels better, drives MUCH more smoothly, and it has gained much more power than all my bolt on mods combined. This is no butt dyno power gain, the car is that much better. Plus, since I bough the tuner version software, I can retune my car whenever I want as well as use the Cipher software to data log the car and monitor it any time. not to mentioned map switching, read and clear DTC, etc.
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