I'm not really sure why you'd want to lean on the port side since di is more efficient and the di system in the s550 is overkill for what it needed to be. But I do hear what youre saying and you very well could be right. I'm somewhere around 50% di/pi
I was looking for some larger injectors and I got some. I wanted to replicate Shawn's 994 number on the 100mm. I switched to e85 larger injectors larger rails larger feed line. No fuel restrictions possible. The car made 893 which is about 15 more than on the previous setup with smaller...
I would bet a lot more have not done it than have done it. I haven't done it. I know a few people on another ess board that are pushing quadruple digits without doing them as well.