B Series Megaphone Header 4-1 Collector RF V2 B16 B18 B20

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B Series Megaphone Header 4-1 Collector RF V2 B16 B18 B20 RMF Skid Plate Pipe

The B Series Megaphone Header 4-1 Collector RF V2 is designed for Honda B Series engines including the B16, B18, and B20. This header features a 4-1 design that merges the exhaust gases from four cylinders into a single collector, resulting in improved exhaust flow and a significant boost in horsepower and torque. The RF V2 version includes a unique megaphone design that enhances exhaust note, giving your engine a distinct, aggressive sound. Made from high-quality materials and expertly crafted, this header is the perfect upgrade for anyone looking to take their B Series engine to the next level of performance.

RMF Version 2 header features a true 4-1 merge collector, with a megaphone to create equal exhaust flow & delivers the best peak horsepower gains while utilizing a 1-piece design.


  • 304 brushed stainless steel
  • True 2.5 inch collector
  • Megaphone with reverse cone
  • Hand TIG welded
  • A/C and P/S compatible (slim fans required)
  • CNC machined manifold flange
  • One year warranty
  • 18 gauge, 304 stainless steel
  • Includes OEM spec header gasket
  • Includes OEM spec donut gasket
  • One piece design
  • Includes skid plate
  • Half core radiator must be used
  • Recommended for 1.8L-2.0L engine displacements
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