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Your last question is the most important one. Why? Why Meth?
In my personal opinion it is not worth it to install water/meth unless you are looking to go above what a flash tune can already provide. Meaning if you have a flash tune is producing 600whp, there are other tunes out there that can make more up to a certain point. Beyond that point, water/Meth is needed if you want to make more power. That point is 700whp. The stock fuel injectors on the S63tu just can't make any more power than that. But with water/meth you can go beyond that. So unless you are willing to build all supporting mods at the 700whp and beyond, water/meth won't be of much use.
Good luck.
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