You can think about it like a mini turbo-timer. I'm pretty sure it just gives itself a moment to decompress anything that might still be pressurized.
__________________ Wedssport SA-55M 18X9 +20
CXRacing Evo X intercooler piping kit + BOV (Greddy Type-S)
Cobb AccessPORT Stage2 93 Octane
D2 RS Coilovers
Evo X FMIC
Ultimate Racing turbo-back
400HP clutches from Jack's
AEM Intake