Woosh Sound?

I believe that to be the intake vacuum to 1atm suction sound as I previously described. I will admit it is very pronounced, like you have a K&N cone filter or something. Having BMC filters will make it more pronounced, but maybe you should do the following tests:
1. Inspect L and R BMC filters to make sure they are seated correctly and have not failed in some way. Also make sure they are sealing correctly. If both sides sound the same, the chance of a specific filter install issue is minimized.
2. Reinstall your OEM filters and shoot another video.
3. Go to your local cars n coffee or other get together with 360s and go for a ride in another 360 to listen to their intake.

I dont think you have an issue, but I am not 100% sure of that. What might cause an audible suction sound that is non intake related:
1. Disconnected or failed intake vacuum line.
2. Failed intake gaskets
3. Failed or loose intake clamps

Notes:
1. On my 2006 F430 (different animal all together) I can nOT hear intake suction with stock filters.
2. On my Porsche Boxster with 3.4L 911 engine and external K&N Cone Filter, I hear almost EXACTLY what is in your video. I can make a video if you wish? Its loud, pronounced, and ever so slightly cool.
3. On my race motorcycles with 4x individual K&N cone filters bolted to the top of the velocity stacks I get this noise as clear as day and VERY loud. I also get an intake roar that may damage hearing. Intakes can be loud.

 

I say its not:
1. BMC Filter mounting height
2. BMC Filter allows more air in (it does allow air to be vacuumed in more easily)
Its more likely;
3. BMC Filter allows more sound to pass through its core material, thus allowing more road noise into the intake and more intake noise to your ears.

I think you have no issue and can drive and be happy....

 

Nice one mate. Glad to know its just the filters and nothing else. Could you possibly please do another video with stock filters just for comparison?

 

Thanks so much for that. There's clearly a big difference. The initial woosh seems greatly reduced but also the intake roar as the revs build up also seem muted? Did you notice that as well? I think I might have to get some stock filters as to me the pure engine sounds are what it's all about for me.

Love the pops and crackles too although since putting super unleaded in a few weeks ago and closing my exhaust valves they seem to have disappeared, even with a new tank or regular fuel. Think I need to unplug the valves again and do an ecu reset to get them back. As for the asr active, thats just the car telling me I would be in a ditch bleeding heavily if it wasn't for its technology! Hehe.

Wonder how much putting in a challenge flexi pipe would also effect the noise in both aftermarket or stock filter setups. Would it effect the noise more or less than just changing the filters? Trent, did you ever take any before and after videos of your modded intake runners that could give an idea?

 

I had BMC filters in CF air boxes in my 360 and to the best of my recollection it sounded pretty much like what you've captured. periokid may be able to verify if he's still running that setup.

 

Just thought I would revive this thread. Just installed some K&N in my 360 spider. Had it out for the first time with the new filters and noticed this sound. Good to hear it is nothing major.

I figured with the new 360 owners, if you swap out the filters this might be a situation for you.

Deiger