Exhaust header 4-2-1 for optimized flow.
Made like the Volvo R-Sport headers.
Don't fit togehter with generator.
Works togehter with:.
Original single carb intake.
Original dual carb intake.
Original fuel injection intake.
For B20E/F the lower hole must be made in the manifold
The exhaust manifold and B20E/F intake manifold has different thickness so it needs to be shimmed to same thickness