I think its his external wastegate that dumps into his exhaust. There is no way his BOV dumps to the exhaust, that would mean his piping for his BOV/intercooler is connected to the exhaust, which means all the pipes for the intercooler would get REALLY hot. Therefore his car would be slow as balls.
You have mistaken the external wastegate for the bov. The external wastegate is a lot like a bov, but it is for the exahsut side and not on the intake side of things. True if you have a external wg dumped into the atmosphere it is REALLY loud.
__________________
I own H22Prelude and her body
1989 Toyota Supra Twin Turbo -FOR SALE!!
-1JZGTE motor, Greddy profec B, HKS BOV, autometer gauges, 3" Blitz Nur Spec R Exhaust, MkIV Rims, Yokohama A032R tires . FOR SALE!!! PM ME!!
1997 Mitsubishi Eclipse GST
Mods: AGP L2R, victoy performance 2.5" O2 housing with 40mm External wastegate, Denso 660's, IRC Race FMIC, 2.5" intercooler piping, 3" dejontool intake, BBK 255lph fuel pump, Blitz Dual turbo timer, Greddy profec B, Stillen 3" downpipe , 3" Tanabe Racing Medallion exhaust, Greddy type S BOV, Apexi EL EGT, Apexi EL Boost Gauge, translab shift kit, alto end clutch, Eibach pro kit, tokico illumina shocks, HKS 264/272 cams, 1G head swap, RRE SS valves, crower titanium retainers, crower valvesprings, mitsu 3 layer metal headgasket, DSMlink, ARP rod bolts, ARP head studs, Aeromotive AFPR with stainless braided lines and B&M gauge, stainless oil feed line with inline filter, gay vitek plug wires, RRE catch can, thin fans, and much more.