My two cents are that the performance gains are minimal and largely marketing hype. I suspect you’d need a 25+ horsepower boost to really notice anything, and even then that isn’t that much.
I have a 98 two-door (4x4) that the previous owner installed JBA headers and a Dynomax(?) dual in, single out muffler on. It has 3.73 gears and stock injectors.
I also have a 98 Z71 with true dual exhaust, no name mufflers, generic catalytic converters, stock headers, 3.42 gears and the multiport injector upgrade. After swapping the injectors, the truck has noticeably better throttle response than the Tahoe.
From what I’ve seen, the injectors gave the most bang for the buck. If, in the future, you’re taking the intake off for the gaskets, that’s an ideal time to swap the injectors out.
Others may have better experiences, perhaps some exhaust products and certain combinations are better than others. I’d be interested in hearing what others have found.
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