No, a factory Subaru engine block cannot be turned into a closed deck with bolt-on parts or a home shop job. IAG builds its closed deck blocks by machining new Subaru case…
The Perrin 2.4 inch turbo inlet hose replaces the pleated factory inlet on a 2004 to 2021 STI, a 2002 to 2007 WRX, or a 2004 to 2008 Forester XT with a…
The best first upgrades for a 2022 and newer Subaru WRX (FA24) are a COBB drop-in air filter, fresh COBB spark plugs, and a COBB Accessport tune, followed by a COBB flex…
The most effective brake refresh for a 2004 to 2007 STI replaces three parts at the same time: Goodridge stainless steel lines for a firmer pedal, Hawk HPS 5.0 pads for stronger…
For a manual transmission 2008 to 2021 STI or 2008 to 2014 WRX, the Mishimoto Performance radiator is the best value, the Mishimoto X-Line adds a thicker three row core for harder…
ARP head studs become necessary on a 2002 to 2012 WRX or STI once boost or power targets move meaningfully past stock levels, since factory head bolts are not rated to keep…
Five small COBB parts under one hundred dollars each address specific failure points that turn into bigger, more expensive problems if left alone: an intercooler isolator bushing, a throttle body coupler, a…
COBB is known for the Accessport, exhausts, and turbo hardware, but the brand also makes a set of small, inexpensive parts that finish the details those bigger purchases skip entirely. A silicone…
Five Perrin parts under sixty dollars each clean up common annoyances on a WRX or STI without touching engine or suspension tuning: a battery tie down, a pulley cover, a trunk handle,…
Three parts under forty two dollars each measurably tighten up shift feel on a WRX or STI: a rear shifter bushing, a clutch delay valve delete, and a billet clutch fork pivot.…
Drivetrain slop on a WRX or STI comes from three specific places: soft rubber bushings in the rear differential mounts, play in the driveshaft carrier bearing setup, and flex in the diff…
Lowering a WRX or STI on springs pulls the front camber negative, shifts the front roll center, and throws the rear control arms out of their factory geometry, and a standard alignment…
A WRX or STI that feels completely sorted on the street can run into real trouble the first time it sees a track day. Sustained hard driving pushes cooling, braking, clutch engagement,…
Buying performance parts one at a time is the normal path for most builds, but COBB also sells a bundled option for the Subaru STI that packages three of its most popular…
The factory boost control system on a 2008-2012 Subaru WRX or Subaru STI was engineered for stock hardware and stock boost targets, and it starts showing its limits the moment a build…