Not every fuel system upgrade needs to be built around E85. For WRX and STI owners running gasoline and looking for a straightforward, cost effective pump upgrade over the factory unit, the…
More power always means more heat, but the point where cooling actually becomes a limiting factor is not the same for every build. A mild bolt-on car and a big turbo E85…
The whoosh sound of a blow off valve is one of the most recognizable signatures of a modified turbo car, and it is easy to assume that sound comes with a real…
Both of these pumps show up constantly in fuel system upgrade conversations for the WRX and STI, and it is easy to assume the choice just comes down to picking whichever one…
Short ram intakes and cold air intakes each solve a different problem, and each creates a tradeoff the other one does not have. A short ram intake sits closer to the engine…
Every hard launch, every shift, every burst of boost causes the engine and drivetrain to move slightly against their mounts. Most owners notice this as a feel issue, a slightly disconnected sensation…
The AEM 340LPH 65mm Fuel Pump Kit is one of the more popular in-tank pump upgrades on the WRX and STI platform, covered previously in the post on why serious builds skip…
Every time a turbocharged WRX or STI accelerates hard or shifts, the engine and transmission rock slightly against their mounts. The factory pitch mount is built from a plastic composite tuned for…
A turbo inlet upgrade often gets sold on the promise of better throttle response, and it is easy to see why that claim spreads. A bigger opening sounds like it should mean…
The factory turbo inlet on a 2015-2021 Subaru WRX is made of hardened plastic, and after years of heat cycling, that plastic becomes prone to cracking. A cracked inlet or a failed…
Adding an external fuel pump to a WRX or STI build solves a flow problem, but it introduces a wiring problem most people do not think about until the pump is already…
Shift feel on a 2002 to 2007 Subaru WRX is one of the more noticeable places where factory parts leave a gap. The stock shifter has a long throw with some slop…
Turbo upgrades and boost numbers get most of the attention in a WRX or STI build, but the fuel system is usually what actually decides how far a car can go. Every…
Most WRX and STI fuel system upgrades start with an in-tank pump, and for good reason, they are simpler to install and cover a wide range of power goals. The AEM 380LPH…
A stock Subaru STI fuel system was built around stock power. Add bigger injectors, a flex fuel setup, or a serious tune, and the factory rails, lines, and pressure regulator start showing…