this is what it will sound like (start 1:45), hollow.
the reason is the exit from the TD0x(H) wastegate (not TD05HR), the deflection of wastegate flapper and the size of the vented tubing creates a hollow sound. the sound is made worse by a almost standard engine because of the lack of exhaust flow through the dump.
the sound most people associate "screamers" with is from a external wastegate vented externally. because an external wastegate usually relies on a popit valve, under actuation it creates a chattering sound, this sounds totally different to a vented internal, which sounds like shit.