There are dyno's on the site of the stock box/HPS tubes/K&N drop-ins. The power gains between the stock boxes (13hpish) and the G3 (16hpish) is about 2-3 HP in favor of the G3. The ones I saw were on a Z with HFC's and aftermarket exhaust if I recall. The G3 seems to yield more high end (less used) power while the HPS/K&N drop-in yields more mid-range power (everyday driving power). For a 2-3hp difference its hard to justify spending the extra money unless you want some bling in you engine compartment or want to go for max HP regardless of where it is. The G3 has more documented testing to date because thats what everyone's been using until recently. It seems more people are starting to use the HPS/K&N option and I think you'll likely see more testing as its popularity increases. Right now HPS tubes are back ordered everywhere so its fair to say that they are gaining popularity.
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