All of this anticipation is killing me. I ordered the UPR the other day but now I am considering returning it (despite the 20% "restocking" fee). I have an unmodified car so the "25hp" winner would be my obvious choice. But there is no way I can wait. Is the Densecharger the consensus winner...if it is...is it the one with the 6 or 9 inch filter? I need help. I can't continue to drive around with my car suffocating.