The SRS 4-2-1 K-Swap Exhaust Manifold (2.5″ outlet) is designed for performance-minded K-Series swap builds that need improved mid-range torque, strong scavenging, and consistent flow. Built from SUS304 stainless steel with CNC-machined flanges and mandrel-bent tubing, this header delivers both durability and real gains.
Each unit is hand TIG-welded and fully ported and polished to ensure smooth airflow from primaries to collector. The 2.5″ donut-style outlet integrates cleanly with most aftermarket or custom K-Swap exhaust systems.
Perfect for street, track, and time-attack applications.
Features:
• 4-2-1 design for improved mid-range torque
• CNC stainless steel flanges
• 2mm thick pipe walls
• SUS304 stainless steel, mandrel-bent
• Fully ported + polished ports
• Hand TIG welded construction
• 2.5″ standard donut collector
• Includes all gaskets and mounting materials
Pipe Configuration:
• Primary: 45mm
• Secondary: 50mm
• Outlet: 63.5mm (2.5″)
Specifications:
• Manufacturer: SRS Exhaust Systems
• Manufacturer SKU: HPH-CV92421K
• Included: Gaskets + mounting hardware
• Material: Stainless steel
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