The noise is loud. Sucking noises at low rpm to higher pitch turbo scream in upper rev range. On partial throttle lift off, there are slight flutters but not as loud as in a skyline. Otherwise a short sharp whoosh on lift off.
That seems to be the verdict with HKS. But they flow quite well and I just replace it for 25 bucks if it gets dirty. I used a 3A racing pod before and they are supposed to be quite good too. I found with 3A and HKS that the car ran more solid boost. With the AEM or Apexi, the car seemed to run lower boost.
06 6MPS Radiant Ebony Luxury
Car sold and dearly missed