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Grimmspeed one has shown some gains, especially with an aftermarket tune to take advantage of the additional air.
You can "max out" the stock intake design by swapping the piping with a smoother metal or silicon pipe and either modify the snorkel or replace with an HKS or Greddy snorkel (will require you to remove the bumper). Add a cloth or foam drop in filter as well.
On a stockish tune either approach is worth about +5-7whp
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