Congratulations, you just offset part of the added weight for the aero parts.
For the exhaust exit, if you are relocating it anyway, piping it to exit behind the rear tire or at the trailing edge, the exiting gasses will play a small part in filling the low pressure void thereby reducing drag. I seem to remember a picture of a faired NSU that did this. Just thought it was a neat idea.
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Good design is simple. Getting there isn't.
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