I never heard the apexi WS in person but heard it online...A friend of mine has an 06 si and i like its tone and noise level. How is it compared to the apexi ws II on a gsr/ gsr with intake or stock intake?

 

ITS VERY QUITE, I HAVE A WS2 CATBACK, AND AEM SHORT RAM, WHEN DRIVING REGULARLY, ITS QUITE, ALMOST LIKE STOCK, BUT A LITTLE LOUDER THAN STOCK, BUT WHEN U PUT THE PEDAL TO THE METAL, IT SOUNDS PRETTY NICE, LIKE WHEN I WAS GOING TO VEGAS, NICE DEEP, NON-TIN CAN, SOUND.