Stillen G3's are pretty much the accepted "standard" on the forum. They're the most commonly done and have proven gains which are very consistent from car to car.
If you're still looking at long tube types, there's Akuma Motorsports' intake, Takeda's intake, and there's also Nissan's NISMO R-Tunes. Those all show similar gains and price (except for the Nismo which I believe is very expensive in comparison, but absolutely zero cutting/trimming).
Some forum members have also had great experience with R2C intakes, which are a short ram type.
Generally speaking, your gains come from a straighter, less turbulent flow pattern, as the accordion segment in the stock intakes (which are already true cold air) damages the air flow, causing turbulence and slowing flow. It's part of the reason why post-MAF tubes and K&N drop ins are a popular alternative to a full intake (as it shows decent gains as well).
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