Exhaust manifold 4-1
Model: Amazon, 140
Engine: B18-B20
Inner diameter of primary tubes: 34.5mm
The primary tubes join together to form a 3" collector
Length of primary tube: about 68cm
The manifold tapers down to 55mm (internally)
Thickness of the flange: 10mm
Use the adaptor pipe that comes with cones down to 2 "to fit the Simons 2" exhaust systems
037-E
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