You wouldn't really be comparing apples to apples with using software designed to be used with IR head configurations on a siamese port head. You are assuming that changes that improve or hurt an IR headed engine will do the same with a siamese headed engine. I wouldn't pay full price for any software, I would see if you could find a used copy on ebay for a lot less. But again, since it wouldn't be an apples to apples comparison, it might lead you to false conclusions that over time you might actually begin to believe.
