whoosh whoosh whoosh

[caledonianewan]

hello, i have an evoII which has a dump valve and an hks airfilter. when i let the throttle off i get a repeating whoosh from the car, loud and it sounds exellent. i thought it was just the dump valve, but the noise comes from the air filter. the car runs 10-12 psi, anyone know what would be making this noise? lots of people have said that evo is definatly not standard. aprt from, cat back,air filter and dump valve i cant see anything else thats been done. any ideas if there could be some hidden modifications?

[boostkingnee]

hi mate

pm petbeemer there aint much he dont know about early evos

cheers
billy

[E3GSR]

what dump valve is it m8? if its recirc it dumps into the intake and that could be the noise.

[caledonianewan]

arc dump valve i think, and it dumps to atmosphere.