Ihave a fully reco unit, has a top advance curve which is perfectly progressive and total with no variation . it is a bolt in unit, comes with right ignition coil to suit , and i warranty the distributor for life, thats right ,, $550 , if you think thats expensive you will eventually find out the hard way, please no postage , or i can fit it for you if you are in melbourne , otherwise dont reply . these are special units that have been built accordingly for zeds, there is quite a few people on this site that has my dissy in their car just ask them how they perform, but then again they probably dont even know who i am