Originally Posted by
rogwick
Hey mate, if you want the typical "spool" sound, what you want is a pod filter complimented with a CAI or SRI. The induction noise of the pod gets louder as you creep up RPM. Once you release throttle, you get a kind of draw-back through the filter which sounds like a BOV to the common person anyway. I've got head turns, compliments and comments from my seemingly loud car with just the intake alone. All the BOV will give you in terms of noise is a small "tishhh" not the actual spool noise you hear on most turbocharged cars.
There is also a trick with my CAI setup, if I builld up boost (around 5-7pounds) and 'ease' of the throttle, I get a flutter noise which sounds great. It's a similar sound to the Megane vid below...