Grimmspeed Stage 1 Power Package - 15-21 Subaru STI - 191013 100F-300F Cometic Exhaust Manifold Gaskets utilize

Cometic Exhaust Manifold Gaskets utilize the same technology that goes into Cometic Headgaskets

A013 pressure plate features an exclusive diaphragm design to increase clamp load

you can either purchase the 15-17 post MAF hose and GrimmSpeed Sound Plug Delete

T028X is an ACT Xtreme pressure plate that uses exclusive diaphragm design to increase clamp load

Grimmspeed Stage 1 Power Package - 15-21 Subaru STI - 191013 100F-300F Cometic Exhaust Manifold Gaskets utilizeThe beauty of the GrimmSpeed Staged Power Packages is that all of the included components were designed and tested to work well together as a complete system. Instead of piecing together parts from many different manufacturers and hoping that they're design theories are compatible, consider starting with one of our excellent Staged Power Packages based on your goals! The GrimmSpeed Stage 1 Power Package is an excellent place to start when modifying