The aFe MACH Force XP Exhaust Catback 409 SS 01-05 BMW 325i/ci & 330i/ci (E46) L6 2.5L/3.0L is a performance exhaust system designed to increase horsepower and torque on BMW E46 vehicles. This cat-back exhaust system features 409 stainless steel construction for superior durability and corrosion resistance. The free-flowing, mandrel-bent exhaust piping reduces backpressure and increases exhaust flow for maximum performance, while the included 4 stainless steel polished tips give your vehicle an aggressive look. The system also includes all necessary hardware and instructions for a hassle-free installation.