Contact any Titleist authorized retailer and they can quote you a price.

Dale is the man just ask him about anything

The Mitsubishi MMT shaft is not in the current catalog. Your choice is to have a Titleist authorized dealer check with Titleist if it can be special ordered as an exotic upgrade, or work with a custom club builder (Club Champion being one example) for a quote.

This is primarily a user group, not with access to Titleist ordering. Large dealers use a suggested retail price based on stock components. Exotic options are set by the dealer. So the price may vary. If you scroll through the U510 web page, a chat box should appear, and a support person may be able help you.

my u510 4i is butter