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That's flow through a tube, which is a different calculation than the above equations for flow across a plate. Use this:
Re=D*V*rho/mu,
where D=dia, V=velocity, rho=density of exhaust gas, mu=viscosity.
The assumption that exhaust gas = air (rho=1.3kg/m^3 at STP) should get you within an order of magnitude.
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