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The exhaust manifold found in the 1998-2006 BMW E46 chassis was designed to combine the exhaust gasses from each of the 6 cylinders quickly with a manifold that was cost effective to produce. Our long tube off-road header is a Tri-Y design to allow the exhaust gasses to flow more freely from each of the 6 cylinders and combine in a more efficient manner. Tubing has been optimized for the 2. 5L, 2. 8L and 3. 0L engines. This creates a reduction in cylinder backpressure and improved exhaust gas velocity. These improvements free up lost horsepower and torque. An added benefit is a more performance oriented exhaust sound. Replace for BMW E46 3-Series (1999-2000) BMW E39 5-Series (1996-2000) BMW Z3 (1996-2001)