hi there its 399.99 for a 200 amp & its 449.99 for a 270 amp &700.00 for a 350 amp alt they all come with the volt boost Modual and All Mechman alternators are thoroughly dyno tested to 10,000 rpm rotor speed, and feature a one year manufacturer's guarantee against defect.its best to call so give matthew a call at -1 888-MECHMAN (632-4626) and there shop is in Knoxville TN hope this helps ya out ! basshead30 out.