 #BOV-SB001A. Synapse Engineering SB001 Blow-Off Valve Kit A universal pull-type BOV that eliminates leakage by seating the valve more as boost pressure increases. $221.07 |  #BOVA-SB001.1A. Synapse Engineering SB001.1A Aluminum Weld-On Flange Aluminum Weld-On Flange with O-Ring for SB001 Blow-Off Valve. $33.47 |  #BOVA-SB001.2A. Synapse Engineering SB001.2A Stainless Steel Weld-On Flange Stainless Steel Weld-On Flange with O-Ring for SB001 Blow-Off Valve. $39.89 |