Sounds like great choices. I would go with a LSD after all the intake/exhaust mods. And I'd do that before any headers. The HP gains of exhaust mods apparently come mainly from the first change, with smaller incremental gains after that with each one. An LSD will get that power to the pavement on your touring Z (and will make me jealous!).
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Rain, snow, sleet, hail: 2009 Mazda 3 sGT HB
Everything else: 2009 370z, PW Touring 6MT
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