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yes, you must use premium fuel. the chip makes power by controlling timing and fuel curves. those timing and fuel curves are set with premium fuel. 93 octane will burn cooler and slower and 87 octane will burn hotter and faster. if your timing is set for 93 octane and you put 87 octane in there, you will experience detonation and damage can occur. too understand it better i will give an example. if your running 87 octane your computer adjusts the timing to 10 degrees before tdc at idle. if you run 93, your computer is going to have to advance the timing more to about 12 degrees btdc because the fuel burns slower.
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