Radium Turbo Exhaust Manifold Lotus Elise/Exige 2ZZ-GE Engine
Stainless steel exhaust manifold with T3 flange for the Toyota 2ZZ-GE engine, designed and produced by Radium Engineering. The T3 turbo flange is tapped for M10x1.25 studs (not included).
Turbocharger placement was carefully evaluated to make turbo kit installation simple. The turbocharger is located high enough to promote low resistance oil return back into the oil pan, exhaust downpipe easily clears the subframe, and turbocharger air inlet clears the transmission shifter cables.
Furthermore, the placement away from the head allows larger radius primary exhaust runners. Manifold mounting holes are designed to allow the manifold to expand without inducing stresses on the fasteners.
A casting manufacturing process was chosen for high repeatability suited for volume production without the inconsistencies commonly found with fabricated manifolds. Lost wax (investment) casting process was chosen over a low quality sand casting because of its superior surface finish, tight tolerance holding, and the absence of a parting line. Every manifold is CNC machined to precise dimensions to ensure a perfect fit every time.
347 stainless steel was used for its high thermal capacity, low thermal conductivity, and resistance to thermal cycling. Additionally, this material will not rust, but will change color when it is heat cycled for the first time.
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