K&N Drop ins, tubes, motordyne (or DEpointfive0) intake manifold, used Nismo cat back (from a Nismo Z). Block off all the resonators on the intake tract...
You'll have a big fat torque curve (relatively speaking) and plenty of intake howl at high throttle input to make lots of noise for you without being any louder than stock in normal driving. Peak HP will be in the neighborhood of 290-295 WHP with area under the curve being hugely improved.
Then you can do some HFC's later.
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