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U can figure about 1 pd per 100 thousand. Example from a 4 to a 3.9 is 100 thousands of an inch smaller and would give u about 1 pd more.
As far as total is completely dependent on atmosphere car build ect. What one person sees for boost is almost usless to another unless they are in the same location with the same weather ect.
Best to start with what u have and use the 1 per to get where u want to be.
another example I run about a 3 hundred thousand bigger in the winter cooler weather here at 1000 ft. Keeps about the same power.
If i run a 3.7 in summer I run a 4 in winter or cooler weather example. What boost my car makes in my location would have very little baring on what u would see on ur car at ur location.
If i went to Florida I am most likely gonna see more boost, I would say average 1 to 2 pds maybe more depending on the current weather. That means more power as well. Just from the weather would run better but then boost adds on top of that.
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