im tryin to figure out what the diff is in the MS these 2 companies offer...and i guess what all i need, id like to get msII, to replace my portfueler and go full stand alone, with timing/ignition control and 2 step.. can any one shed light on what the diff is? looks like the black cased MSII from diy is cheaper, but does it have the same features as the symtech? and will it be configured for the 420a?any help is greatly appreciated. thanx guys.