The recirculating version of the famous Q blow off valve.
Can be left open to the atmosphere (makes an even nicer sound!) but is designed to easily plumb-back it's discharge to the air intake for quieter (and legal) operation, avoiding momentary over-rich conditions due to atmospheric BOV's on most draw thru MAF turbo setups.
For use on turbo-charged and super-charged application
CNC-machined from 6061 aluminum alloy
V-Band mounting clamp w/ Stainless Steel hardware
Teflon-lubricated, hard anodizd stem
high temp silicone Nomex diaphragm
aluminum weld flange is furnished included (SS available $)