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That's what I had heard as well.MS2 can only control 2 batches (2 injector outputs). I have 2 banks of 4 injectors in parrallel. MS3 can run fully sequential (individually), but requires more complicated input sensors. I've heard the only real world benefit of sequential is better emissions, and the ability to tune cylinders individually (requires each exhaust runner to have an o2 sensor bung in order to get individual feedback). I was skeptical about the batch fire system, but it works great!