Gaskets Heat Riser Restrictor For Acura Rl. If you are still running the stock exhaust manifolds with a heat riser, block the heat riser it the open position. Replace malfunctioning or frozen valves--fit OER exhaust manifold heat riser valves.

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If cold starting and warm-up is not an issue, plug them up.

Help is just a click away! OER exhaust manifold heat riser valves warm up your cold engine. Choke-Heat Riser Tubes & Related Parts; Distributor Vacuum Lines; Engine Related Parts; Fuel System and Related Parts; Fuel Tank Vapor Return Lines; Fuel Tank Vent Lines;.