i tried one of these he351ve on my 4bt and it was a little laggy. but seeing how many are using drive pressure to open the vanes instead of boost, i wonder... With drive pressure i think i could tighten the collar up a little more possibly spooling quicker. is that what you guys have found using drive pressure? and with boost acting to close it...perhaps keeps the barking down as well? does it boost quicker than an he351cw? or he341? thanks