Get a 2xs manifold with differnt length pipes!! the different length mani pipes is what gives the boxer its note, i should record my gen1 cuz it sounds simular to the wrx.
The wrx has 2 header pipes that feed into one, these pipe are very different in length. one pipe is the width of the engine ie 1mtr (mesurements are illustration only not real mesuremnts) and the other VERY short comes out of teh header into the exhaust where the 2 pipes meet. So its the time delay in sound/timing that gives it that sound.
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Many want Power not many hold it long.........