I don't know if the Z has those, but on the G35/G37, we have two large resonator boxes that attach to the air filter box itself. They are located under the air filter boxes so they will have to be removed if you wish to remove the resonators.
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08 G35 5AT Sedan | Stillen CBE | Invidia HFC | Injen CAI | Uprev Tune | Akebono BBK | Tanabe Coilovers | Hotchkis Sway Bars | GTSpec FSB | Black Headlights & Grille | Volk GT-F Wheels | Hankook V12 Evo Tires
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