2003-2009 Toyota 4Runner Mid-Pipes

Improve 4Runner exhaust flow with 2003-2009 Toyota 4Runner Mid-Pipes replacing restrictive center sections. These pipes connect catalytic converters to rear mufflers, using larger diameters than stock equipment reducing backpressure while accommodating aftermarket exhaust systems requiring specific connection points.

 

4Runner mid-pipe selection requires understanding emissions implications and whether catless designs pass inspections in your jurisdiction. Some areas enforce strict testing catching aftermarket exhaust modifications, while others have lenient or nonexistent enforcement making legal concerns vary dramatically by location.

 

Mid-pipes serve as the critical link between front and rear exhaust components, forming a key part of the overall 2003-2009 Toyota 4Runner Exhaust system. They work seamlessly with 2003-2009 Toyota 4Runner Cat-Back Exhaust setups that handle the rear sections, while connecting directly to 2003-2009 Toyota 4Runner Headers up front. When upgrading your 4Runner’s exhaust, treating the system as a complete flow path—rather than a mix of isolated components—delivers the best performance and sound improvements.