Question....How did you buy a Touring without Nav? That is impossible, unless either A) the dealership swapped out head units, B) you are confused about the differences between Touring, Sport and so on, or C) they sold you a base model listed as a Touring. Can you post some pics of either the window sticker or the car itself?
That aside..Welcome to the community!
To answer your questions:
1) Removing the plastic engine cover will not harm anything. However, your dealership may ask why it was removed later on being that the car is so new. I would not advise trashing it by any means.
2) With the full list of bolt-ons plus a tune, you will see north of the 300 rwhp mark easily. Just depends on how indepth you go, parts selection and tuner.
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