I like chatter better then the DV sound, but many people ar using them to get popular.... which they dont...
You should only put DV on if it is nessecery, on rs-t i would guess about 14psi an over...
Cosies have them standard, so they are escused
I have tryed 6 different on my car, but i use them to get performance AND protection to my engine/turbo....NOT sound