Yeah since the FSW kit is a suck through set up you'd be blowing off metered air to atmosphere. I HIGHLY recommend upgrading to the FSW diverter valve (DV20). It's only a $100 upgrade and it sounds AWESOME!!
FR '11 FF Moderators pick
Oct '11 ROTM
FR '12 Carlisle Nifty Fifty Award/Best in Boost/Best 08-11/Finest Five Pick
FR '13 Carlisle 1st Place Award 08-11 Focus