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I had the same reasons as you for wanting the twin screw kit, so I got it. Those reasons didn't come through and so now I no longer have the kit and am back at NA.
The setup also couldn't take track abuse. Not for longer than 5 laps.
My advice would be to go FA20club kit. The have a couple of the basic kits at the Avo price point, but it's upgradable, and they use garret turbos. Ask AVO where their turbos are made.
I enjoy my car better NA. It suits the car better IMO. I also really beat on it at the track, and it's good to see how much power the serious FI builds are getting. Gives me a heap of confidence in the longevity of being at near stock power levels.
Based on what you're wanting, I would recommend doing some NA mods first, that if aren't enough will work with a turbo kit. Try Toda/TRD flywheel, 4.55FD, crank pulley, lightweight wheels (they don't have to be expensive)
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