If you wanna remove the spring I would suggest to change it with the 20% one. There are few threads about this. If you feel like a big boy, I HIGHLY recommend RJM pedal 
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2013 PW 370Z Touring+Sport, NAV
Tint 35% side, 18% back | RJM clutch pedal | ZSpeed SS lines | Stillen Gen3 CAI | Fast Intentions HFC and TDX 12'' CF CBE | UpRev
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