Looking for a way to reduce high intake temperatures on your stock or modified STI? The solution is the Mishimoto direct-fit top-mount intercooler engineered specifically for the 2008–2015 Subaru WRX STI. Mishimoto engineers spent months designing and testing this new intercooler to ensure optimum performance on both the street and track. This intercooler utilizes durable cast aluminium end tanks TIG-welded to a highly efficient, dense bar-and-plate core. The Mishimoto intercooler has a 3.75" thick core and a total volume of 584 in3. Thanks to this volume and a very dense offset fin pitch, we are able to optimize heat transfer and support vehicles from stock up to 400 whp. This intercooler endured rigorous testing, showing a 10°F temperature drop as well as a +5 whp and +7 wtq bolt-on power increase for our stock test vehicle. Installation is simple, requires no modification to the stock A/C line, and can be completed in under 30 minutes. Included with this intercooler are new Y-pipe gaskets, a new BPV gasket, a silicone PCV hose, and a silicone throttle-body coupler. These components negate the need to gather supplies for installation, and they ensure years of reliable service. This intercooler is available in a durable powder-coated finish of Sleek Silver or Stealth Black, and it includes the Mishimoto Lifetime Warranty
Cooler Overall Size
24.5" x 11.5" x 4.25"
Cooler Core Size
21" x 7.25" x 3.75"
Bar-and-plate with cast end tanks
Tank Wall Thickness
Cooler Inlet / Outlet
Inlet: 2.5" x 1.313" (x2)
Outlet: 2.56" I.D. / 3.00" O.D.
Cooler Fin specs
Internal: 4.7mm fin height, 2.8mm fin pitch
External: 6.5mm fin height, 1.7mm fin pitch
Intercooler to throttle-body coupler hose specs
PCV hose specs
4mm thick Cooler Weight
08–15 Subaru WRX STI
(1) Bar-and-Plate Intercooler
(1) Intercooler to Throttle-Body Transition Coupler
(1) PCV Hose
(1) Bypass Valve Gasket
(2) Y-pipe to Intercooler Gaskets
(1) Black Nylon Hose Fitting, 3/4" I.D.
(1) Black Nylon Tee Hose Fitting, 3/4" I.D.
This kit is rated for 250–450 whp with maximum limits of approximately 500 whp, or 30 psi of turbo boost. Exceeding that horsepower or pressure limit may require a larger front-mount intercooler.