You won't lose power compared to stock if you're installing the right parts.
1. You may lose a small amount of torque on the low end but not enough to notice, after a *GOOD tune you will gain all your losses back plus some.
2.Success rate of gaining power after a tune is pretty much 100% , *as long as you're being tuned by a tuner who knows what they are doing*.
The tune makes the difference but even without one, there are many dynographs floating around showing proven gains.
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