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I guess I should add more here..

Stock original HP exhaust manifolds with a new accurate exhaust system including the "hi flow" hemi mufflers.



That is exactly what i was talking about concerning restrictive exhaust systems. Thats about enough pipe and muffler for a 318 4bbl. If you're not attached to the stock look and sound and are still looking for some more efficiency later on, look into a TTI X-pipe system and headers for a 440 in your car. Its really a win win deal. More power, better efficiency, cool sound.