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To get the Subie sound, you need a UEL header. Lot`s to choose from. JDL`s are VERY nice, but for the price, I think you can`t go wrong with the Openflash Header + Openflash tablet combo. You get the header and the tuner/data logger for a bit over 1000$.
You`ll get a bit of performance out of that, but the rest is pretty much all small gains. I would stay away from Air-Intakes as the stock system is surprisingly very good. Adding a simple K&N or other high flow drop-in filter will get you almost the same gains, plus their are a few thing you can do for free to change the intake sound and even performance like modding the intake air scoop.
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