hacking the air box base allows a bit more flow. the FTRA gets teh air there, but the stock opening is a bit small. you can easily pick up about 10-15% more surface area in the base of the air box for more flow.
i also forgot to mention !MAF screen before. it allows a bit better flow for teh air once it gets through teh filter. not a huge gain, but every little bit helps.
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