This unit has all of the features of the BTM, plus it allows you to adjust up to 15° of advance under vacuum conditions (idle or cruising speeds). This advance helps smooth out the idle, increase mileage and improve off - the - line performance. Must be used with a MSD 6, SCI, 7, 8 or 10 Series Ignition Not legal for sale or use on pollution controlled vehicles. 8962$296.99 Don't see what you want? .......... Need help? Or, IF THERE IS NO ORDER BUTTON AVAILABLE on the part you want to buy, please call us TOLL FREE at 1-888-6 GO FAST(1-888-646-3278) Monday - Friday 8AM - 4:30PM Pacific Time and talk to one of our experienced Sales Agents. Some parts may not be legal for sale or use in California and other states on any polution controlled motor vehicles. Check your local laws for use. Copyright © GoFastParts.com all rights reserved. No part of this site may be reproduced without prior written consent.