Originally Posted by CO_VR4

Thanks for the bump. It is a genuine HKS BOV directly supplied and installed at Road Race Engineering in SoCal. The tubing is thicker wall aluminium 2.5", custom fabbed by RRE. It uses 2.5" couplers. I offered the BOV w/upper pipe so the flange is already welded to the pipe. You can use it as is, or adapt by having the pipe shortened or extended by welding. It is much cheaper this way than full fabrication of a UIP.