What Bov is this??

R2D2 won’t flow that HP volume… a SARD race , HKS race or Greddy High pressure make those ’ dual stage’ noises at that HP.

Otherwise, wioth lower power ( less volume ), an HKS SSQV with a different ring insert, the R2D2 inline, not the side vent and probably a few others I can’t think of at the moment.