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In regards of power, changing the intakes shouldn't make much of a difference… if any. The way an engine makes more power with turbo is different than NA. Raising the boost pressure will allow more air into the cylinder to produce more power. A free flow intake system helps more on NA.
When you are pushing the turbos to its limit is when you’ll see a power increase from changing the intake. Some people are at the point, but not many.
The main purpose I would change the intake, other than a cooler sound, would be to increase the size of the intercoolers. The power potential of adding 2 more inches of intercooling is far greater than changing the intake.
There’s a reason why you’ll find many companies spending R&D for downpipes for our cars instead of intakes. Performance gains are easily proven with downpipes oppose to intakes on a turbo application.
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