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For a four cylinder, you should probably go turbo, as it is the more efficient than a supercharger. Turbos can be more finnicky and take a little more tuning than a supercharger, but it's worth it. My suggestion also, is get a better ECU also. Jet makes shitty shitty ECU stuff unless you have a V8. Most of their shit doesn't do a damn thing for the car except make it slower =)
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