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What I meant by wasted spark mode, was instead of firing the LS coils one at a time sequencially, fire two at a time.
I believe that's what was meant in the other thread, too. Not that the LSx coils have wasted spark mode, but that he wanted to fire two coils from one trigger supplied by a waste spark DIS. The trigger for the LSx coils is (as I thought) a 5V positive signal. There's a "REF LOW" connection which is a ground path directly back to the ecm. Now if you are a lucky kind of guy you might be able to apply 5V to the trigger line and ground the REF LOW through the ignition module, but I wouldn't expect that method to work.