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IC.2.3.1 The intake manifold must be securely attached to the engine block or cylinder head with brackets and mechanical fasteners. Hose clamps, plastic ties, or safety wires do not meet this requirement.
The use of rubber bushings or hose is acceptable for creating and sealing air passages, but is not a structural attachment.
IC.2.3.3 Intake systems with significant mass or cantilever from the cylinder head must be supported to prevent stress to the intake system.
a. Supports to the engine must be rigid.
b. Supports to the Chassis must incorporate some isolation to allow for engine movement and chassis flex.