2015-2021 Subaru STI

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

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

The GrimmSpeed Gentleman’s Exhaust returns with a redesigned Version 2. This version is focused on improved install flexibility, long-term durabili...

The GrimmSpeed Gentleman’s Exhaust returns with a redesigned Version 2. This version is focused on improved install flexibility, long-term durabili...

The GrimmSpeed 6-Speed STI Shifter Bushing Kit replaces the factory rubber shifter bushings with higher durability polyurethane components designed...

DESCRIPTION Upgrade the weak factory horn on your Subaru with the GrimmSpeed Hella Horn Kit for the 2015–2021 Subaru WRX and 2015–2021 Subaru STI. ...

DESCRIPTION The GrimmSpeed Hella Horn Wiring Harness is a simple, plug-and-play solution designed specifically for the 2015-2021 Subaru WRX and 201...

DESCRIPTION It’s inevitable, you’ll eventually want to replace your OEM Subaru oil cap. Whether it's leaking, worn out, or just an eyesore, the Gri...

DESCRIPTION It’s inevitable, you’ll eventually want to replace your OEM Subaru oil cap. Whether it's leaking, worn out, or just an eyesore, the Gri...

DESCRIPTION It’s inevitable, you’ll eventually want to replace your OEM Subaru oil cap. Whether it's leaking, worn out, or just an eyesore, the Gri...

DESCRIPTION The GrimmSpeed Titanium Radiator Shroud for the 2015–2021 WRX and STI transforms one of the most visible areas of the engine bay into a...

DESCRIPTION We decided on a subtle design for this cover that mimics the “vent” styling on our matching GrimmSpeed Alternator Cover. Is it made fro...

DESCRIPTION Upgrade your Subaru’s performance with the GrimmSpeed Engine Mount for the 2002+ WRX and 2004+ STI. Designed as a direct replacement fo...

DESCRIPTION Protect your 2015–2021 Subaru WRX or STI with GrimmSpeed Mudflaps, designed specifically for the VA chassis. These mudflaps shield your...

DESCRIPTION Install Hella horns cleanly and confidently with the GrimmSpeed BroTie Mounting Bracket and Wiring Harness Bundle for the 2015–2021 Sub...

DESCRIPTION Upgrade your cooling system with the GrimmSpeed Titanium Radiator Cap, rated at 1.3 bar for improved thermal control and reliability. B...

DESCRIPTION Upgrade your 2015–2021 Subaru WRX or STI engine bay with GrimmSpeed Titanium Fender Shrouds. These precision-crafted titanium panels re...

DESCRIPTION Transform your 2004–2021 STI with the GrimmSpeed Short Throw Shifter, designed to deliver sharper shifts, tighter engagement, and preci...

DESCRIPTION Upgrade your EJ engine bay with the GrimmSpeed Titanium Alternator Shroud for the 2002–2014 WRX and 2004–2021 STI. Designed for enthusi...

The stock single-piston caliper found on most Subaru platforms gets the job done — but it wasn’t designed for the kind of aggressive driving, track...

DESCRIPTION The GrimmSpeed Front Strut Bar for the 2015-2021 Subaru WRX/STI blends precision engineering with clean aesthetics to deliver serious p...

DESCRIPTION The GrimmSpeed Front Strut Bar for the 2015-2021 Subaru WRX/STI blends precision engineering with clean aesthetics to deliver serious p...

DESCRIPTION Replace your missing or damaged up-pipe hardware with the same high-quality kit included in all GrimmSpeed Up-Pipes. Designed for durab...

DESCRIPTION The GrimmSpeed OEM Style Gasket offers superior sealing performance with upgraded materials and construction. While most exhaust gasket...

DESCRIPTION It’s inevitable, you’ll eventually want to replace your OEM Subaru oil cap. Whether it's leaking, worn out, or just an eyesore, the Gri...

DESCRIPTION The GrimmSpeed Head Gaskets feature a multi-layer steel (MLS) construction, in which multiple grades are used to provide optimal surfac...

DESCRIPTION We decided on a subtle design for this cover that mimics the “vent” styling on our matching GrimmSpeed Alternator Cover. Is it made fro...

DESCRIPTION We decided on a subtle design for this cover that mimics the “vent” styling on our matching GrimmSpeed Alternator Cover. Is it made fro...

DESCRIPTION Lightweight Batteries are an excellent and inexpensive way to remove weight from your Subaru, which has an OEM battery tipping the scal...

DESCRIPTION Lightweight Batteries are an excellent and inexpensive way to remove weight from your Subaru, which has an OEM battery tipping the scal...

DESCRIPTION Have you ever thought to yourself, "Man, Trent, you've got all of these awesome parts but how are you supposed to let your crew know yo...

DESCRIPTION GrimmSpeed™ OEM Style Gasket, better than OEM quality at an attractive price.At GrimmSpeed™ we have worked with endless amounts of afte...

DESCRIPTION The standard GrimmSpeed Shift Knob is one of the most popular in the Subaru aftermarket for a reason. They are the perfect mixture of r...

DESCRIPTION Tired of being teased for your corroded alternator and boring engine bay? Step your Alternator Cover game up; GrimmSpeed has just what ...

DESCRIPTION Tired of being teased for your corroded alternator and boring engine bay? Step your Alternator Cover game up; GrimmSpeed has just what ...

DESCRIPTION Tired of being teased for your corroded alternator and boring engine bay? Step your Alternator Cover game up; GrimmSpeed has just what ...