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depends....if it is advanced too far, the knock sensor would warn the ecu which would knock it back to stock specs..but if its advanced to 15* then there would be no harm(as long as u run premium fuel)
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91 se-r : sr20det= the beast
96 sentra : ga16de= pimpness
00 frontier : ka24de= tow truck
01 sentra : gq18de= stock mofo
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