2015-2021 Subaru STI

DESCRIPTION These are the GrimmSpeed TGV to Engine Gaskets. If you need to replace your OEM gaskets, then the GrimmSpeed units make for a quality r...

DESCRIPTION Exhaust leaks seem to be an all-too-common issue with most modded Subarus. The most guaranteed leak you will get is if you run an after...

DESCRIPTION The Grimmspeed Top Mount Intercooler Y-Pipe Kit has been designed to work with factory or aftermarket top mount intercoolers. This is a...

DESCRIPTION To help keep chassis deflection at bay and to keep any large dents out of your front fascia we’re offering the GrimmSpeed Bumper Bar as...

DESCRIPTION This is the Grimmspeed Splitter that is available for separate purchase. This particular splitter comes with the Grimmspeed Top Mount I...

DESCRIPTION This is the GrimmSpeed Air Oil Separator. If you're familiar with modifying your vehicle, then you will know the importance of an air/o...

DESCRIPTION GrimmSpeed believes that there has not been any major changes to the unequal exhaust manifold in some time, and this is due to the tigh...

DESCRIPTION The GrimmSpeed Dry-Con Air Filter is a high-performance direct-OEM replacement panel filter that has been designed to flow more air whi...

DESCRIPTION The main purpose of the Grimmspeed License Plate Relocation Kit is to position the license plate to the OEM tow hook provision. The f...

DESCRIPTION The GrimmSpeed V2 Bypass Valve received many upgrades such as a redesigned the internal piston to eliminate the potential failure point...

DESCRIPTION These are the Grimmspeed Head to Exhaust Manifold Dual Port Gaskets. These particular gaskets see some of the highest temperatures when...

DESCRIPTION The Grimmspeed OEM Downpipe To 3-Inch Cat-Back Adapter is very popular for those of you who are retaining the stock downpipe and need t...

DESCRIPTION The GrimmSpeed Turbo To Downpipe Gasket is made using a premium multi-layer steel with a stainless steel fire-ring, this gasket surpass...

DESCRIPTION The main purpose of the Grimmspeed License Plate Relocation Kit is to position the license plate to the OEM tow hook provision. The fr...

DESCRIPTION This is the GrimmSpeed Downpipe Donut Gasket. This gasket is available as a direct replacement for your leaking OEM donut gasket and fe...

DESCRIPTION The GrimmSpeed Ceramic Coated 2 Bolt Up-Pipe has been designed to be a high-performance direct replacement for your factory up-pipe to ...

DESCRIPTION We designed this up pipe using our in-house FARO Arm along with the latest and greatest Solidworks CAD Software. This assures that we c...

DESCRIPTION We designed this up pipe using our in-house FARO Arm along with the latest and greatest Solidworks CAD Software. This assures that we c...

DESCRIPTION The GrimmSpeed StealthBox Cold Air Intake System is the result of countless invested hours in research and development to provide the p...

DESCRIPTION The GrimmSpeed Stage 1 Power Package combines GrimmSpeed's Cold Air Intake System, as well as the GrimmSpeed 3-Port Electronic Boost Co...

DESCRIPTION This is the GrimmSpeed Top Mount Intercooler. Once you start performing modifications that add more horsepower and more boost, eventual...

DESCRIPTION The GrimmSpeed Cat-Back Exhaust System has combined premium materials, along with a larger piping diameter and smooth bends to provide ...

DESCRIPTION GrimmSpeed's new Overtake BB500 Turbocharger is another powerful turbocharger designed by GrimmSpeed. The Overtake Ball-Bearing 500-Ser...

DESCRIPTION The GrimmSpeed Cat-Back Exhaust System has combined premium materials, along with a larger piping diameter and smooth bends to provide ...

DESCRIPTION The GrimmSpeed Front Mount Intercooler Kit from GrimmSpeed has been designed with a great balance of low-pressure drop and high-tempera...