because HKS = HK$, the DLI and the twin power amp are both like $eleventybillion.
the b&m is like $2xx and XS Engineering makes one that is the same thing and is like $275 new. same thing but not $400 like the HKS twinpower amp.
and carlos, how many wires are on it. the XS is 3 wire, hooks up inline to the distributor, or on a DIS, inline with ignitor/coil packs i believe.