anti lag is only ingition retard about/more than 40 deg after TDC


if you have programable ECU you can try retard ignition and add some fuel at engine breaking (very low manifold pressure and high rpm)

if not you must buy standalone ECU most of them have ALS function, it can also be done by some piggyback's (i'm trying to do this by SMT6 - www.perfectpower.com )