does everyone has this whistle at about 2k rpm under light acceleration? i have the stillen filter with frankencar midpipe and i was wondering if the injen makes the same whistle also. it was ok at first, but it really gets annoying sometimes. i was thinking that maybe because the injen filter would be a lot lower, maybe it wouldn't be as loud from the driver's seat.

 

i have it as well. i'm use to it and just deal

 

I have it too. It's really not that bad. I could barely notice it.

 

do the injen guys have it too?

 

i have one too...Not annoying at all


Eric

 

I like it, sometimes other people think it sounds like a turbo spooling. No complaints here.

 

you would have to find a filter like the apexi with little or not rubber in the filter. its just the air resonating off the rubber.

 

i like the sound

 

apexi does it too, sloppy

 

the only apexi ive heard has been in blubyu2k2's car with a franken midpipe and theres no whistle at any rpm. i just assumed all were like that.

 

i got a wepon r intake piping with a dinan(BMW performance company)high flow filter for a '95 328i. and the whistle is pretty loud, i can hear it over a normal conversation going on with all windows up! i like it i have had some people ask if i was turbo! it is a good feeling!

 

Floor it and the whistle will go away

 

My K&N Dropper does it all the time, Now complaints here, for some reason Its even louder when you have a Breather

 

My JWT does it as well. I love the noise.

 

I don't think anything you can do to the intake will get rid of the whistle except for getting longer piping or a more restrictive intake. I'm pretty sure it originates from the butterfly valve in the throttle body, as you apply light throttle the air whistles when trying to squeeze around the slightly open valve.

 

Yeah you're lucky you dont have a Bimmer. The whistle that comes with the intakes that I have heard sounds aweful. Our whistle however is AWESOME. But BMW makes some sort of thingy that cuts down on the whistle a bunch. I dont know if they make something like that for the MAX. Research it and find out what it is. Maybe you can make a custom application.

 

Hmmm....after I switched to an apexi filter I hardly hear my whistle anymore.....probably just a coincidence though.

 

Yea don't worry mang...I have the exact same problem: a whistle around 2k under light acceleration. I was buggin about it too but people here said it was okay and normal. I think the theory about it being the butterfly valve is probably correct. The way it changes pitch or disappears proportionally with the throttle makes it seem like thats the case. If it was something in the pipe or the cone I would think it wouldn't be so sensitive and reactive to the throttle.

 

I had the same problem, and it does sound cool for a while, but managed to get the sound to go away by adjusting the throttle body bypass valve. Just twist it clockwise with your finger, or you might need to use a flat head screw driver. Good luck.

 

i got the K&N cone and have same whistle. doesn't bother me, i now have a turbo

 

i experience this whistle sound coming from my intake even at idle. is this normal?

 

i have never heard the whistle at idle. the only noise you should hear is a sucking sound from it pulling in air. i would check to make sure your throttle cable is not too tight and keeping the butterfly valve in the throttle body too far open.

 

ok well it was just the sucking noise i hear at idle and low speeds. is this normal to be able to hear the syucking noise so loud from just a K&N filter and midpipe?

 

I get the whistle too with my bomz. If you goose the gas just right, you can whistle at women walking down the street. I have managed to become a pro at this while driving around at CSU.

Ted

 

I have a Budget CAI and I get a whistle above 4k RPM at anything more than 1/2 throttle...

 

My Bombz CAI roars at 4k rpm MChapel

Peace.

 

of course, I meant that I get the whistle in addition to the roar.

 

If you all try adjusting the bypass valve on the throttle body you'll be able to change idle and part-throttle sound characteristics of the intake. Atleast with my injen I can make it whistle or not, and make it quiet at idle, or make it sound like a wooshing/sucking sound at idle. By-product is that it will change your idle rpm slightly...no big deal though.