All of the plumbing from the stock intake really shouldnt matter. Whether any air comes up from there or not wont affect the airflow to the filter.
The filter itself may be a bit restrictive and just be deadening out the sound. But there's a catch to that, less restrictive filters let more particles past, more restrictive filter will capture more dust/dirt. You could take the filter off, turn the car on, and rev it to see if there is a change in sound without the filter. That may help you determine if the filter could be a potential reason as to why it isnt louder.
A couple of question for you, some of which may sound a bit... dumb.
-Do you have any sound deadening under the hood? Such as a mat that attaches to the hood?
-Do you have more sound deadening on the firewall? FatMat, Dynomat, etc?
-Are you trying to gauge the sound from the intake with the windows rolled up?
u can only take in as much as u can push out
so im guessing its not gunna suck in any extra air over stock if that air cant get out
The OEM intake is restrictive itself. Yes, the small diameter exhaust is not helping, but an aftermarket intake will be louder, regardless of the exhaust.
Think of it like this. (just an example)
The engine can move 100x of air.
The stock intake can pull in 60x of air
The stock exhaust can handle 80x of air.
If you open up the intake, you end up with 120x of air coming in (but the engine is only capable of pulling in 100x, where as the exhaust can push out 80x). Its capacity for this example is reduced to 80x, equal to that of the exhaust. The intake isnt working at full capacity, but its still bringing in more air than stock.
