Show me a CAI for our cars that has 3rd party verifiably performance increases and I might buy it myself.... but I, like you, do not want to spend 200-500 on 30-50 in parts unless, at least for myself, there is an uncompromised benefit. With my engine it is go before show.
There are quite a few threads and exponentially more posts on this exact topic.
Outside of sucking hot air...The main restrictions are the filter and to a greater extent the TIP(turbo inlet pipe). Unfortunately, as noted above, my AFE high flow filter is suspect in letting dirt into the engine, I’m flipping to an OE to verify.
Additionally, and historically, Un-reinforced TIPs have been shown to collapse during boost ramp up. I have posted a way to mitigate this deformation. There is speculation on the benefit, but I know this won’t hurt.
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