Well I'm not sure about that. I didn't but the guy I got the kit from did not say I had to. What turbo do you have?
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1985 celica supra upgrading to street/drag well mainly drag. Have complete HKS T4 turbo kit, electronics and all, Getting head port and polish with HKS 264 cams, and port and polished intake with 6 extra injector bungs. Eagle or crower rods? I just bought a 1990 MA70 n/a  . 
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