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I need help with tune!
Ok we'll I got an s13 with sr20 It has walbro 255, upgraded turbo manifold , upgraded intake manifold , 3 inch piping from turbo back , it has stock t25 and my question is will I need to tune it or will it be safe to start it and just drive like that? I'm almost don't with project just need to finish wire harness. It has the stock ecu. And also if I do need to tune would an apexi safc 2 do the trick?
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