All I can say is HOLY SHIT!!! This is what my Z has been missing all these years since I done all my go fast mods. It woke up my Z drastically. My Z would take a little while to build boost with my 525's out of the hole but now RIPS the tires! Only negative to the Selin kit was that I had to cut my Stillen GTZR bumper cover slightly for the two air filters to fit. This mod is worth every penny and Specialty Z is awesome for getting the kit to me so fast.