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Discussion Starter #1
On an engine with Valvetronic such as my N46B20, does the Valvetronic negate the effect of an aftermarket cold air intake (when compared to the stock intake setup)?

For this thread, the definition of an "aftermarket cold air intake" is going to be a cold air intake system in which the pod filter is relocated down into the area behind the front bumper's leftside-bottom grill, in front of the front-left wheel's mudguard.

The reason I am asking this is because the stock intake setup is already feeding cold air from the kidney grill into the intake manifold, and the only difference from an aftermarket setup described above would be just the air's flow rate through the actual filtration element (in which the aftermarket one is presumably higher).

However, since the engine uses Valvetronic, a surplus amount of air is constantly waiting at the mouth of the intake valve ports anyways because the throttle butterfly valve remains wide open by default under normal operation conditions. Therefore, doesn't this surplus air negate the extra amount of flow rate provided by having an aftermarket intake filter?
 

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it works the same, a CAI is really only a supposedly higher flowing filter as most BMW have proper ducting from factory anyway. its debatable whether the aftermarket filters are actually any better. sometimes the BMW ducting leaves alot to be desired though
 

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Discussion Starter #4
Aftermarket intakes are a scam.
According to Engineering Explained, apparently not. He has test results that prove otherwise - conducted on his naturally-aspirated non-Vtec Integra.
 
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