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HUGE difference between 4-10 degrees on my car when I put the stock chip in.
Now I just leave the timing at 4 degrees and program everything in the chip, and only 'fine-tune' with the initial timing setup.
In the cold weather in the NorthEast, I could go up to 8degrees and not worry about knock, and during the summer I had to drop to 6 and sometimes
4degrees due to humidity to not get detonation, and the car felt way slower/different.