I Recently did a k20a2 motor swap into my ek.

* Stock k20a2

* K tuned headers

* 200cell cat

* 2.5'' custom exhaust to a vibrant muffler

* custom Cai with a blox velocity stack.

* Hondata k100

Heres my current symptom

Everytime I Clutch in and change gears I hear an air whooshing noise like a BOV.
I find it weird because my car is n/a and the sound is quite noticable daily driving (windows up, no music playing).

What are your thoughts on this?

Thanks guys =]