This is the Replacement Tuned Pipe for the Street Force GP. / / FEATURES: All Metal Construction / Anodized Purple / Tuned Pipe will work on .12 to .16 size engines. / / INCLUDES: One Purple Tuned Pipe / One 4X4mm Set Screw for support wire(not included, use DTXC8315) / One Gold-Colored 90deg Pressure Fitting / / SPECS: Length: 5-1/4" / Intake Diameter: 15mm (5/8") / / REQUIRES: Threadlocking compound