2003-2009 Toyota 4Runner Throttle Body Spacers

Squeeze a little more out of the 4.0L without opening the engine, and 2003-2009 Toyota 4Runner Throttle Body Spacers do exactly that by introducing air turbulence before the manifold that helps the fuel charge atomize more completely. The gains are subtle rather than dramatic, but on a naturally aspirated platform where every bolt-on adds to the stack, they're a sensible early step.

 

Spacer thickness selection matters more than most people give it credit for — going too thick can introduce intake resonance and dull low-end torque even while potentially helping at higher RPMs. Drive-by-wire clearance needs to be confirmed on the 4.0L before purchase, since the electronic throttle body has tighter packaging constraints than the cable-actuated unit on earlier 4Runners.

 

Throttle body spacers make the most sense when the intake system they're feeding is already doing its job well, and cold air options that work upstream are at 2003-2009 Toyota 4Runner Cold Air Intakes & Air Filters. The engine performance build for this generation goes further than just intake work, and 2003-2009 Toyota 4Runner Throttle Body Spacers slot into a bigger picture covered at 2003-2009 Toyota 4Runner Engine Performance Parts. Owners ready to leave bolt-ons behind and add real forced induction can see what's available at 2003-2009 Toyota 4Runner Superchargers Kits.