I went with Sp500’s on one of my Z’s back in the day. Will be a good upgrade over stock, and they’ll be brand new so if you decide to upgrade injectors at a later date(simple plenum pull) you’ll easily get to your desire of 400+. FWIW with Sp500’s, full 2.5” DP/TP/Exhaust/POP/ECU @ 17psi—I put down 400hp/410tq if memory serves. May have the dyno chart if you’re interested.
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