In one of your posts about a month ago regarding the sd concepts tensioner for a procharger you stated that you ran 14psi on a 6-rib belt (using sd concepts tensioner) with no slipping issues, is this with your current f1 blower? I am also going with an f1 and assume you went with the 6-rib for space, do you think an 8-rib belt-pulley set-up will fit without any modifications? I heard the 12-rib will even fit but you have to hack the electric fans. Also one last question-- have you increased the boost past 14psi, if so when did you start seeing slipping issues? Thanks for any reply!!!!