Not sure what the dealer is recommending, but if it's this primary gear and chain set it will increase your rpm's for any given road speed, not decrease them.
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G. SCREAMIN’ EAGLE PRO
RACE USE PRIMARY GEARING KIT
This is the kit that will help you get the holeshot at the race
track. This kit increases vehicle acceleration by allowing
the engine to spin higher RPM at any given vehicle speed.
This new combination results in a 1.7:1 primary drive ratio,
versus the stock 1.44:1 ratio. Requires separate purchase
of Primary Cover Gasket. Kit includes 21 tooth compensator
(25 tooth is stock) sprocket and primary chain. For race
application only.
40331-02 Fits ’94-’06 Softail®
and ’94-’05 Dyna models. $134.95
40200-02 Fits ’94-’06 Touring models (’99-’01
fuel-injected models require 36
Tooth Clutch P/N 37707-98A). $134.95
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If you just want to drag race, this would be a good idea. If you want to cruise the highway at a reasonable engine speed, not a good idea.
Jerry