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If the shop is known for building performance engines, I think I'd push for them to do all the extras you can get. I would expect anything done that is mostly labor, like balancing, and part replacement to be free. I would also expect performance parts to be at cost and no labor cost. You have them at the best advantage you'll ever have them. But I would push for this only if they are known for performance work. Otherwise I'd push for a new engine swap.
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