Originally Posted by roure94
Would the charcoal delete w/ k&n filter drop-in will make it sound better?
How much gain of HP?
It does not make a lot of sound difference, neither do the euro or performance intake as they are closed systems. That said, closed systems are the best for actual performance in a BMW, for sound in the cabin, you would need an open system which some people have seen a loss in performance from. Either way, it is personal preference.
I have the common setup, cyba scoops, k&n with charcoal delete and like it for the price and stock appearance.