Originally Posted by -GUV-
I rotated the rubber intake sleeves 180deg as they aren't very well port matched, no more noise.
Could you elaborate on "rubber intake sleeves rotated"? I installed the CPR on my 990SMT (secondary flies out, Wings, TuneEcu 7/21/12 "kevtx" map).
I had assumed the whistling at cracked throttle was just throttle body/butterfly noise now unmuffled?