Mishimoto Top Mount Intercooler Black w/ Red Hoses 2008-2021 STI

Looking to reduce high intake temperatures on your stock or modified WRX STI? The Mishimoto Direct-Fit Top-Mount Intercooler is engineered specifically for 2008–2021 Subaru WRX STI models to improve cooling and performance on both the street and the track.

This intercooler features durable cast-aluminum end tanks TIG-welded to a dense, bar-and-plate core. With a 3.75-inch-thick core and a total volume of 584 in³, it optimizes heat transfer and supports vehicles from stock up to 400 wheel horsepower. Rigorous testing has shown a 10°F reduction in intake temperatures, along with a +5 whp and +7 wtq bolt-on power increase on a stock vehicle.

Installation is straightforward, requiring no modifications to the stock A/C line, and can be completed in under 30 minutes. The kit includes all necessary components for a complete installation: new Y-pipe gaskets, BPV gasket, silicone PCV hose, and silicone throttle-body coupler, ensuring long-term reliability and performance.

Features

• Reduces intake temperatures by 10°F compared to stock
• Proven +5 whp and +7 wtq bolt-on power increase on stock vehicle
• 3.75-inch-thick core with 584 in³ volume for optimal heat transfer
• Supports vehicles from stock up to 400 whp
• 100 percent aluminum construction with durable cast end tanks
• TIG-welded bar-and-plate core for efficient cooling
• Direct-fit installation in under 30 minutes
• No modification to stock A/C line required
• Includes new Y-pipe gaskets, BPV gasket, silicone PCV hose, and throttle-body coupler

Included:

• (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-in I.D.
• (1) Black Nylon Tee Hose Fitting, 3/4-in I.D.

Installation Guide