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You will definitely feel more power and car being more responsive.
That being said it is really hard to achieve company's time, dont forget they probably had better tires than you have, professional driver , tested it in the perfect weather condition and who know how many time it took for them to get these results.
if you plan on only adding tune, stage 1 is enough.
If you plan on going FBO and using e85, u need stage 2.
Dont forget that stage 2 also offer more features like in-dash controls.
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