Power wise you will loose a fraction, only turbo engines can gain and some other odd engines but teh vast majority will loose a small amount of power. You also use a little bit more fuel but still a significant saving
If you go the hidden filler path you can only get the very small type in and mean you have to screw in the extension each time you fill. What I prefer to do is fit the filler below the bumper opposite side to teh exhaust. This means you can fill from either side.
As to what kit is best there are pros and cons to each kit. Speak to the installers you are considering and ask them what their prefered kit is
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