You should talk to Nick McCollom about them. He helped with the developement for the highport spacers on his NX. I believe that the gain was about 6-8hp or about the same as the 4 pulley UR set and the kit is only $115. Matt Ostlund Pittsburgh, Pa 93 NX2000 w/stuff >Anybody have any experience with this? >http://www.outlawengineering.com/nissansr20hiframe.html >Thomas Fox >93 NX2000