2003-2009 Toyota 4Runner Cold Air Intakes & Air Filters

Increasing your 4Runner's power output begins with performance-oriented 2003-2009 Toyota 4Runner Cold Air Intakes & Air Filters drawing cooler air from outside the engine bay. These intake systems replace restrictive factory airboxes with free-flowing designs supporting horsepower gains while adding satisfying intake sounds during acceleration.

 

Intake installation simplicity varies dramatically between designs. Bolt-on systems use factory mounting points for straightforward installation, while custom setups may require trimming or relocating components that complicates work beyond basic mechanical skills. Heat shielding affects performance significantly-true cold-air intakes maintain lower intake temperatures supporting consistent power, whereas designs pulling warm engine bay air sacrifice potential gains for simpler installation requiring less engineering.

 

Cold air intakes pair naturally with a 2003-2009 Toyota 4Runner Cat-Back Exhaust, giving your engine a more balanced in-and-out airflow setup. They also support your broader 2003-2009 Toyota 4Runner Engine Performance Parts goals by feeding cooler, denser air for improved combustion. And as full builds come together, these intake upgrades often show up alongside 2003-2009 Toyota 4Runner Front Bumpers, especially when owners are refining both capability and under-hood performance at the same time.