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 - 12 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.