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FI is the biggest gain. My car drives almost like stock at 700whp stock heads on 93 octane. I'll never need head work. I can ad boost, meth, or race fuel if i want and hit 800. Car is a monster on the street and it's starting to become a bit much for the street. Depends on your end goals. If you need every ounce, yes go for heads. I'd start with the FI and see how you feel after. Power is addicting but i'm happy with where i am and don't feel i need more. I'm on 305 road course tires and on a crummy road i'm spinning in 3rd if it's cold. My best case is hot sticky road and i get full reaction in 2nd, 1st i cannot get into boost without losing traction the boost hits so hard.
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Whipple 2.9 CAI ID1050x injectors ZL1 Pump JRE FPCM JMS Voltage booster JRE Rough Idle blower cam BTR .660 springs CHE trunnion kit 1 7/8 Speed Engineering Borla Atak JRE scoop 1.5" lowering springs BMR trailing arms and toe links Cradle inserts 704WHP 603WTQ 93 octane
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