If you are interested in making more power, the Stillen kit uses a Vortech supercharger which is capable of flowing more than even the stage 2 Rotrex unit that comes with GTM. However, people have had hit or miss experiences with Stillen kits while everyone with a GTM kit is extremely happy. Most of the praise that the GTM kit receives is the smooth and easy driveability, linear power and torque output, and a very clean install.
I would say that the GTM stage 2 supercharger is the best FI option out there for the Z as it retains linear and instant power delivery which I feel suits the precise and balanced handling of the car. Turbos can't deliver that experience in my opinion.
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-320whp / 259wftlbs-
SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob
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