This is a weird issue for me.
I got HKS SSQV BOV, in my r34 it doesn't sound like what expected it sounded more like Blitz DD sound, there is no psh psh psh sound.
Then I swaped with my mate BOV, in his r33 series 1, it made psh psh psh sound like that sound that I want from SSQV.
Anyone have any idea what makes the different?