X pipe will ruin exhaust tone. Use a pair of Dynomax Super Turbos with the flow directors. Put a half quart of transmission fluid into each muffler and let it soak all night then flip it over the let it sit another night add a little more.
It will smoke for a few miles but after a few hundred miles you will love how it sounds. Perfect, deep low tone with a very slight crackle at idle with the vacuum advance removed and the initial timing raised to 18 or 20.. It will also run much better without that vacuum advance.
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