Tr3jo I would say 5 grams is enough to get you in shit, really it would take a drug that required larger doses like maybe GHB powder where 5 grams wouldn't be considered a lot. Even then who knows really!
I think honestly though, the difference between 2-3 grams and 5 grams is going to be negligible IF (and this is a reasonably big if, depending on circumstances) they can pin a drug manufacture charge on you anyway. If they find all the chemicals and equipment then your charge probably isn't going to be too different if you hae 3 grams or 5, thats just my opinion though but I am by no means a legal expert. I would think your main worry would definately be the manufacture charge, and not small differences in essentially trivial amounts of drug anyway.