aFe POWER Mach Force-XP series cat-back exhaust system for the Toyota 4Runner with the V6-4.0L engine provides speed and style. Designed from 2-1/2" & 3" mandrel-bent, 304 stainless steel, this exhaust system offers greater flow to deliver more torque and horsepower than the factory exhaust. This 4-piece designed cat-back system utilizes a less-restricting, high-flow, muffler to improve your 4Runner's performance while maintaining a deep, smooth tone. 100% hand MIG-welded by certified craftsmen for proven quality and durability, the Mach Force-XP exhaust system includes a 4" x 12" resonated exhaust clamp-on tip to give your 4Runner a clean, finished look.