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lean burn is still sold here, i know my dads civic hybrid is noticeable when it goes into lean burn, but i believe your right, that different cats are used.
as far as the neon, i wont be doing lean burn in it. closest thing to really messing with the engine is possibly the cams from a 2.4L stratus/van, and the intake manifold, both of which should significantly lower my torque peaks rpm. Everything else to help mileage will be reducing drag, weight, and parasitic losses.
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