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I think it would be a more worth while question if you also asked for how much time or how many miles. Lowering the timing brings up the cylinder temps which will decrease life.
10.25 psi on stock bottom right now. But honestly haven't really hit it that much cause it's only been 107 here in Texas lately. That was done maybe twice a couple of weeks ago early in the morning. My IAT's have been around 105-115 now while cruising the open roads. Have plans as well in two weeks to get Meth system ordered and installed. Sick of this heat right now!! In weekend traffic it jumps up to 125-132
I was running 10 lbs before the meth... Now I run boost juice still at 10 lbs went from 16 to 21 degrees of timing... My tune is very rich and should be safe