Is turbo inlet air baffled or routed in an odd way? (I wouldn't expect OEM to be inefficient though.) Streamlining the inlet air via hard piping should make for louder compressor volume (and more importantly, spool, but damn if the M isn't already efficient in that dept.) Hearing the turbos sucking in inlet air is fun.... can't say I'm a huge fan of BPV noises, but.... here's a functional (and maybe louder) piece:
Synchronic DV -
Synchronic BOV -
SB001 design philosophy -
SB001 revision & updates
edit: might snag one of these myself actually... the seals on my Dinan/Turbonetics BPV for the S/C probably needs refreshing/replacing.
edit2: You ricer you!
