Engine Mods

PROTECTION FOR YOUR ENGINE The IAG Air / Oil Separator (AOS) is a smart upgrade for your Subaru. Developed through years of testing o...

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...

EMISSIONS CARB Certified - EO - #D-896-3 for listed fitments Get your WRX charged up! The factory charge pipe that Subaru includes on the t...

EMISSIONS CARB Certified - EO - #D-896-4 & #D-896-2 for listed fitments Meticulous Engineering Meets Unparalleled Craftsmanship You probably a...

PROTECT YOUR ENGINE The IAG Air / Oil Separator (AOS) is a smart investment to safeguard and improve your Subaru's performance. Developed ...

DESCRIPTION At GrimmSpeed we have worked with endless amounts of aftermarket gaskets, none seem to work as well as the multi-layer steel OEM style ...

DESCRIPTION Upgrade your FA20 engine bay with the GrimmSpeed Titanium Pulley Cover for the 2015–2021 Subaru WRX. Designed for enthusiasts who value...

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

EMISSIONS SEMA Certified - SC for listed fitments CARB Certified - EO - #D-896-1 for listed fitments The result of our hard work is one of the bes...

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

Emissions This part is legal under the provisions of EPA’s Anti-Tampering Policy. COBB Tuning has established a reasonable basis (testing resul...

DESCRIPTION Our Pulley Cover is precision laser cut and CNC bent from locally-sourced material and each cover receives a durable powdercoat finish....

DESCRIPTION The GrimmSpeed Engine Bay Cap Set completely replaces the OEM yellow caps under the hood of the 2022+ Subaru WRX. Available in either b...

Description Replace your unsightly factory radiator hoses with the COBB Tuning Silicone Radiator Hoses. Constructed of 3-ply reinforced silicon...

Emissions 50 State Legal. This part is legal for sale and use on Emissions Controlled Vehicles in all 50 states when used in accordance with the ...

OVERVIEW Cover up the lackluster plastic caps that come on your factory WRX/STI (VA/GR/GV) with a cap machined from solid aluminum.  The caps a...

After much demand, it has arrived, the ETS front chassis brace for the 2022+ WRX. This is handmade here in the USA at Extreme Turbo Systems. This w...

DESCRIPTION The GrimmSpeed Post MAF Pipe Kit is an excellent upgrade for your FA24-powered WRX. This kit removes the restrictive corrugated structu...

Emissions This part is not an emissions-related part and therefore can be used on Emission Controlled Vehicles. Description This radiator ...

Emissions 50 State Legal. This part is legal for sale and use on Emissions Controlled Vehicles in all 50 states when used in accordance with th...

Description This alternator shroud is made from 5052-H32 Aluminum, powdercoated wrinkle black, and features a laser etched COBB logo. Why? ...

Description The COBB Turbo Blanket is designed to limit the amount of heat that is transferred from your turbocharger to your engine bay as wel...

EMISSIONS This part is legal under the provisions of EPA’s Anti-Tampering Policy. COBB Tuning has established a reasonable basis (testing results...