I am not familiar with that particular ebc but that seems a little on the high side to me too. I am running a Profec B SpecII in the Z32TT. I can't imagine not having it to dial down the hp. I run "low" boost almost all the time. Keep in mind that low boost for me is about 13.5 psi though.
Um... when she come back right, you won't even dream of selling her.
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'10 ZR Black Cherry Sport/Touring/Nav, Swift Springs, Stillen G3s, 15mm-F 20mm-R Spacers, SPC, Spoiler Solutions Rear Wing, Stubby Antenna