This exhaust manifold for the 1991-1996 BMW E30 4 Cylinder Engine were designed to combine the exhaust gasses from each of the cylinders quickly with a manifold that was cost effective to produce. Our 4-1 off-road racing headers are designed to allow the exhaust gasses to flow more freely from each cylinder and combine in a more efficient manner. Tubing has been optimized for the 1.8L and 1.9L 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.
Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and Durability
i.e. Maximizing Smoothest High Exhaust Air Flow Rate
4-1 High Performance JDM Racing Spec. Design
TIG Welded CNC Machine Flange
O2 Sensor Bung Insertion and Metal Gasket Included
Inlet: 1.75" X 1.25" (4 X Oval Ports)
Outlet Diameter: 1.75"
Piping Diameters: 4 X 1.50" Manifold Piping; into 1 X 2.00" Major Pipe
Increase High Flow Air, Instantly Gain 10 -15 Hp. / Tq.
Includes:
1 x Header exhaust system
All necessary installation hardware
Notes:
100% Brand New
Professional Installation is Highly Recommended
Installation Instruction is NOT Included
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