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Welcome to the site Miket.
Its very hard to say what those mods would all do. It really depends on how the vehicle is driven and under what circumstances. There are just too many variables to know for sure, but you could guess at a couple of % per mod.
The difference between the scangauge and most other things is that the scangauge is a very well developed tool that has been around for years. The others haven't been out quite as long and generally don't have as many features. You'd have to compare them each individually.
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