The Tial QR is the more compact recirculating BOV. Optional 1.00" (Subaru), 1.14" (GTR), or 1.50" (DSM/EVO) reciruclation port, uses the standard TiAL V-band flange and can be converted into a standard Q BOV by swapping the bottom piece.
The TiAL adapter flange is specially designed for Mitsubishi Evolution X. The flange is made of CNC machined aluminum and is available in natural aluminum finish. It is designed to easily replace the original blow off valve with a TiAL blow off valve.