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I do this on all my petrol vehicles, there are almost always gains to be had. be careful though - if the power seems noticably worse, you have gone too far and the computer is winding the spark back from the knock sensor - the knock sensor hears the knock long before it is audible to the human ear. sart with a few degrees and work your way up in 1 degree increments, also check the timing on both the TDC cylinders (1 and 4, 1 and 6) to make sure you are working with the most advanced one.