[230iZTR]

Generally speaking, most modern intake systems in performance cars are pretty well optimized from the factory. The OEMs have way more time and computational power at their disposal to get the best balance of cost, volumetric flow across the rev range, temps across a range of use durations, sound, longevity, etc.

Aftermarket intakes tend to trade low-end power/torque and filtration efficiency for slight power/torque gains at the top of the rpm range, or can make a few hero pulls on a dyno with great gains before heat soaking and performing worse in the real world, or cost a ton of money for relatively minor gains, or only work well in tandem with other specific tuning changes.

I don't have the data to back it up...but you're probably right and should trust your gut. The stock intake is fine, and the aftermarket intakes will offer some tradeoffs, but go ahead and do it you like the look or the noise, or if the specific performance claims the aftermarket manufacturer is advertising appeal to you.