This product is for JB23 (4 to 10 type). ■ Turbo Tune essential item "Blow Off Valve" JB23 original installation stays for model 4 and later! Dedicated stays for installing GRDDY Blow Off Valve for JB23 4 or later The K-Pro original mounting stays are made of all stainless steel and the material is SUS304 with a mirror finish. SUS304 is rust resistant and has a mirror finish on the body, making it effective for dressing up the engine compartment. Made in Japan by carefully selected artisans. Extremely reliable. It also comes with an O-ring that you need to replace it so you can install it right away. ■ Kit contents Mounting stay × 1 O-ring × 1 (installed on the mounting stay) ■ Mountable models JB23 (models 4 and later)