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My oem exhaust manifolds had a minimum of 1/4" extra weld thickness at the entrance & exit pipes pre & post warmup cat. Grinding this away to minimum weld thickness minimizes the flow restriction while maintaining emmisions compliance. This should enhance high rpm power & possibly low rpm torque. Replacing the oem exhaust manifold gasket with a quality, thick header gasket MAYBE will reduce engine temp, although this is the one area of the engine you want hot since hot air moves faster than cold.
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