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Just making some conversation and speculation...
I have zero experience with secondary port injection, but as a general rule simpler is better. I went with LT4 injectors & HPFP... + DSX low side... In hindsight, with similar goals maybe the only thing I would have done differently is go with even larger injectors and HPFP to run full E. Not sure if I would need a cam w/ larger fuel lobe at that point. So I think the deciding factor for me between larger capacity DI vs supplementary port would be whether I would need to add a cam to support DI only.
I like the idea of playing with secondary port injection, but for a primarily street driven setup... I might worry about the complexity of having two systems.
Just some thoughts, again pure speculation... With DI + Port... I would think risks are similar as with DI + Meth from a fueling perspective... Meaning a failure in the supplemental port inj might still allow the engine to run lean, where with ONLY DI if there's a pump failure, it would be more likely to get zero fuel, or not enough to keep runnning, where with supplemental... there might be enough fueling happening to run lean for longer?
Personally I would prefer to exhaust my DI fueling options (heh heh) before going with supplemental port. If you were doing it for fun, that's different! I would love to do it just for the tuning experience.
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