Yeah that's sorta what I mean, as in...
say if you have a 10psi actuator on your turbo and you floor it, the actuator is holding the gate shut until you reach 10psi (which takes no time at all) but then at that 10psi air pressure the actuator opens the gate to bypass the exhaust wheel and stop overboosting, giving you a constant 10psi of boost. Meaning that from say 3000 rpm to gearchange, the gate is open and both outputs of the turbo are releasing the exhaust gases into the dump.
whether it's a stock dump, split dump or bellmouth, but being that both outputs are pumping into the larger chamber of the bellmouth, I thought it might sound a bit fatter.
When I get my Bellmouth on, it will be an upgrade from the stock dump with a 3" frontpipe, where as you have gone from an aftermarket split dump to the Bellmouth which may not be as drastic a change power wise.
and yes SAU does educate but can also be quite misleading at times...